Revert r301487: Replace HashString algorithm with xxHash64

This reverts commit r301487 to make buildbots green.

llvm-svn: 301491
diff --git a/llvm/test/DebugInfo/Generic/accel-table-hash-collisions.ll b/llvm/test/DebugInfo/Generic/accel-table-hash-collisions.ll
index ff2e342..505477c 100644
--- a/llvm/test/DebugInfo/Generic/accel-table-hash-collisions.ll
+++ b/llvm/test/DebugInfo/Generic/accel-table-hash-collisions.ll
@@ -27,12 +27,12 @@
 
 ; Check that all the names are present in the output
 ; CHECK:  Hash = 0x00597841
-; CHECK:    Name: {{[0-9a-f]*}} "k1"
 ; CHECK:    Name: {{[0-9a-f]*}} "is"
+; CHECK:    Name: {{[0-9a-f]*}} "k1"
 
 ; CHECK: Hash = 0xa4b42a1e
-; CHECK:    Name: {{[0-9a-f]*}} "_ZN4llvm16DenseMapIteratorIPNS_10MDLocationENS_6detail13DenseSetEmptyENS_10MDNodeInfoIS1_EENS3_12DenseSetPairIS2_EELb0EE23AdvancePastEmptyBucketsEv"
 ; CHECK:    Name: {{[0-9a-f]*}} "_ZN5clang23DataRecursiveASTVisitorIN12_GLOBAL__N_124UnusedBackingIvarCheckerEE26TraverseCUDAKernelCallExprEPNS_18CUDAKernelCallExprE"
+; CHECK:    Name: {{[0-9a-f]*}} "_ZN4llvm16DenseMapIteratorIPNS_10MDLocationENS_6detail13DenseSetEmptyENS_10MDNodeInfoIS1_EENS3_12DenseSetPairIS2_EELb0EE23AdvancePastEmptyBucketsEv"
 
 ; CHECK: Hash = 0xeee7c0b2
 ; CHECK:    Name: {{[0-9a-f]*}} "_ZNK4llvm12LivePhysRegs5printERNS_11raw_ostreamE"
diff --git a/llvm/test/DebugInfo/PDB/pdbdump-headers.test b/llvm/test/DebugInfo/PDB/pdbdump-headers.test
index f5c4f7f..4152f0f 100644
--- a/llvm/test/DebugInfo/PDB/pdbdump-headers.test
+++ b/llvm/test/DebugInfo/PDB/pdbdump-headers.test
@@ -73,8 +73,8 @@
 ; EMPTY-NEXT:   Guid: {0B355641-86A0-A249-896F-9988FAE52FF0}
 ; EMPTY-NEXT:   Features: 0x1
 ; EMPTY-NEXT:   Named Streams {
-; EMPTY-NEXT:     /LinkInfo: 5
 ; EMPTY-NEXT:     /names: 13
+; EMPTY-NEXT:     /LinkInfo: 5
 ; EMPTY-NEXT:     /src/headerblock: 9
 ; EMPTY-NEXT:   }
 ; EMPTY-NEXT: }
@@ -1837,8 +1837,8 @@
 ; BIG-NEXT:   Guid: {880ECC89-DF81-0B4F-839C-58CBD052E937}
 ; BIG-NEXT:   Features: 0x1
 ; BIG-NEXT:   Named Streams {
-; BIG-NEXT:     /LinkInfo: 5
 ; BIG-NEXT:     /names: 13
+; BIG-NEXT:     /LinkInfo: 5
 ; BIG-NEXT:     /src/headerblock: 61
 ; BIG-NEXT:   }
 ; BIG-NEXT: }
diff --git a/llvm/test/DebugInfo/X86/gnu-public-names.ll b/llvm/test/DebugInfo/X86/gnu-public-names.ll
index cd603bc..44cf0c5 100644
--- a/llvm/test/DebugInfo/X86/gnu-public-names.ll
+++ b/llvm/test/DebugInfo/X86/gnu-public-names.ll
@@ -66,7 +66,6 @@
 
 ; ASM: .section        .debug_gnu_pubnames
 ; ASM: .byte   32                      # Kind: VARIABLE, EXTERNAL
-; ASM: .byte   32                      # Kind: VARIABLE, EXTERNAL
 ; ASM-NEXT: .asciz  "global_variable"       # External Name
 
 ; ASM: .section        .debug_gnu_pubtypes
@@ -198,29 +197,27 @@
 ; CHECK-LABEL: .debug_gnu_pubnames contents:
 ; CHECK-NEXT: length = {{.*}} version = 0x0002 unit_offset = 0x00000000 unit_size = {{.*}}
 ; CHECK-NEXT: Offset     Linkage  Kind     Name
-; CHECK-NEXT:  [[ANON_INNER_B]] STATIC VARIABLE "(anonymous namespace)::inner::b"
-; CHECK-NEXT:  [[MEM_FUNC]] EXTERNAL FUNCTION "C::member_function"
-; CHECK-NEXT:  [[OUTER]] EXTERNAL TYPE "outer"
-; CHECK-NEXT:  [[GLOB_NS_VAR]] EXTERNAL VARIABLE "ns::global_namespace_variable"
-; CHECK-NEXT:  [[GLOB_VAR]] EXTERNAL VARIABLE "global_variable"
-; CHECK-NEXT:  EXTERNAL FUNCTION "f7"
-; CHECK-NEXT:  [[OUTER_ANON]] EXTERNAL TYPE "outer::(anonymous namespace)"
 ; CHECK-NEXT:  [[GLOBAL_FUNC]] EXTERNAL FUNCTION "global_function"
-; CHECK-NEXT:  [[GLOB_NS_FUNC]] EXTERNAL FUNCTION "ns::global_namespace_function"
 ; CHECK-NEXT:  [[NS]] EXTERNAL TYPE     "ns"
-; CHECK-NEXT:  [[ANON]] EXTERNAL TYPE "(anonymous namespace)"
 ; CHECK-NEXT:  [[OUTER_ANON_C]] STATIC VARIABLE "outer::(anonymous namespace)::c"
-; CHECK-NEXT:  [[D_VAR]] EXTERNAL VARIABLE "ns::d"
-; CHECK-NEXT:  [[STATIC_MEM_FUNC]] EXTERNAL FUNCTION "C::static_member_function"
-; CHECK-NEXT:  [[STATIC_MEM_VAR]] EXTERNAL VARIABLE "C::static_member_variable"
 ; CHECK-NEXT:  [[ANON_I]] STATIC VARIABLE "(anonymous namespace)::i"
-; CHECK-NEXT:  [[ANON_INNER]] EXTERNAL TYPE "(anonymous namespace)::inner"
-; CHECK-NEXT:  EXTERNAL FUNCTION "f3"
 ; GCC Doesn't put local statics in pubnames, but it seems not unreasonable and
 ; comes out naturally from LLVM's implementation, so I'm OK with it for now. If
 ; it's demonstrated that this is a major size concern or degrades debug info
 ; consumer behavior, feel free to change it.
 ; CHECK-NEXT:  [[F3_Z]] STATIC VARIABLE "f3::z"
+; CHECK-NEXT:  [[ANON]] EXTERNAL TYPE "(anonymous namespace)"
+; CHECK-NEXT:  [[OUTER_ANON]] EXTERNAL TYPE "outer::(anonymous namespace)"
+; CHECK-NEXT:  [[ANON_INNER_B]] STATIC VARIABLE "(anonymous namespace)::inner::b"
+; CHECK-NEXT:  [[OUTER]] EXTERNAL TYPE "outer"
+; CHECK-NEXT:  [[MEM_FUNC]] EXTERNAL FUNCTION "C::member_function"
+; CHECK-NEXT:  [[GLOB_VAR]] EXTERNAL VARIABLE "global_variable"
+; CHECK-NEXT:  [[GLOB_NS_VAR]] EXTERNAL VARIABLE "ns::global_namespace_variable"
+; CHECK-NEXT:  [[ANON_INNER]] EXTERNAL TYPE "(anonymous namespace)::inner"
+; CHECK-NEXT:  [[D_VAR]] EXTERNAL VARIABLE "ns::d"
+; CHECK-NEXT:  [[GLOB_NS_FUNC]] EXTERNAL FUNCTION "ns::global_namespace_function"
+; CHECK-NEXT:  [[STATIC_MEM_VAR]] EXTERNAL VARIABLE "C::static_member_variable"
+; CHECK-NEXT:  [[STATIC_MEM_FUNC]] EXTERNAL FUNCTION "C::static_member_function"
 
 ; CHECK-LABEL: debug_gnu_pubtypes contents:
 ; CHECK: Offset     Linkage  Kind     Name