[mips] Make TTypeEncoding indirect to allow .eh_frame to be read-only.

Summary:
Following on from r209907 which made personality encodings indirect, do the
same for TType encodings. This fixes the case where a try/catch block needs
to generate references to, for example, std::exception in the
.gcc_except_table.

Previous attempts at committing this broke the buildbots due to bugs in IAS.
These bugs have now been fixed so trying again.

Reviewers: petarj

Reviewed By: petarj

Subscribers: srhines, joerg, tberghammer, llvm-commits

Differential Revision: http://reviews.llvm.org/D9669

llvm-svn: 238863
diff --git a/llvm/test/CodeGen/Mips/ehframe-indirect.ll b/llvm/test/CodeGen/Mips/ehframe-indirect.ll
index f124881..dc06ef7 100644
--- a/llvm/test/CodeGen/Mips/ehframe-indirect.ll
+++ b/llvm/test/CodeGen/Mips/ehframe-indirect.ll
@@ -1,9 +1,11 @@
-; RUN: llc -mtriple=mipsel-linux-gnu < %s | FileCheck -check-prefix=ALL -check-prefix=O32 %s
-; RUN: llc -mtriple=mipsel-linux-android < %s | FileCheck -check-prefix=ALL -check-prefix=O32 %s
-; RUN: llc -mtriple=mips64el-linux-gnu -target-abi=n32 < %s | FileCheck -check-prefix=ALL -check-prefix=N32 %s
-; RUN: llc -mtriple=mips64el-linux-android -target-abi=n32 < %s | FileCheck -check-prefix=ALL -check-prefix=N32 %s
-; RUN: llc -mtriple=mips64el-linux-gnu < %s | FileCheck -check-prefix=ALL -check-prefix=N64 %s
-; RUN: llc -mtriple=mips64el-linux-android < %s | FileCheck -check-prefix=ALL -check-prefix=N64 %s
+; RUN: llc -mtriple=mipsel-linux-gnu < %s -asm-verbose | FileCheck -check-prefix=ALL -check-prefix=O32 %s
+; RUN: llc -mtriple=mipsel-linux-android < %s -asm-verbose | FileCheck -check-prefix=ALL -check-prefix=O32 %s
+; RUN: llc -mtriple=mips64el-linux-gnu -target-abi=n32 < %s -asm-verbose | FileCheck -check-prefix=ALL -check-prefix=N32 %s
+; RUN: llc -mtriple=mips64el-linux-android -target-abi=n32 < %s -asm-verbose | FileCheck -check-prefix=ALL -check-prefix=N32 %s
+; RUN: llc -mtriple=mips64el-linux-gnu < %s -asm-verbose | FileCheck -check-prefix=ALL -check-prefix=N64 %s
+; RUN: llc -mtriple=mips64el-linux-android < %s -asm-verbose | FileCheck -check-prefix=ALL -check-prefix=N64 %s
+
+@_ZTISt9exception = external constant i8*
 
 define i32 @main() {
 ; ALL: .cfi_startproc
@@ -16,7 +18,9 @@
 
 lpad:
   %0 = landingpad { i8*, i32 } personality i8*
-    bitcast (i32 (...)* @__gxx_personality_v0 to i8*) catch i8* null
+    bitcast (i32 (...)* @__gxx_personality_v0 to i8*)
+    catch i8* null
+    catch i8* bitcast (i8** @_ZTISt9exception to i8*)
   ret i32 0
 
 cont:
@@ -28,6 +32,14 @@
 
 declare void @foo()
 
+; ALL: GCC_except_table{{[0-9]+}}:
+; ALL: .byte 155 # @TType Encoding = indirect pcrel sdata4
+; ALL: $[[PC_LABEL:tmp[0-9]+]]:
+; ALL: .4byte	($_ZTISt9exception.DW.stub)-($[[PC_LABEL]])
+; ALL: $_ZTISt9exception.DW.stub:
+; O32: .4byte _ZTISt9exception
+; N32: .4byte _ZTISt9exception
+; N64: .8byte _ZTISt9exception
 ; ALL: .hidden DW.ref.__gxx_personality_v0
 ; ALL: .weak DW.ref.__gxx_personality_v0
 ; ALL: .section .data.DW.ref.__gxx_personality_v0,"aGw",@progbits,DW.ref.__gxx_personality_v0,comdat