MIR Serialization: Serialize simple MachineRegisterInfo attributes.

This commit serializes the 3 scalar boolean attributes from the
MachineRegisterInfo class: IsSSA, TracksRegLiveness, and
TracksSubRegLiveness. These attributes are serialized as part
of the machine function YAML mapping.

Reviewers: Duncan P. N. Exon Smith

Differential Revision: http://reviews.llvm.org/D10618

llvm-svn: 240579
diff --git a/llvm/test/CodeGen/MIR/machine-function.mir b/llvm/test/CodeGen/MIR/machine-function.mir
index a3c1d1d..8f053ad 100644
--- a/llvm/test/CodeGen/MIR/machine-function.mir
+++ b/llvm/test/CodeGen/MIR/machine-function.mir
@@ -25,7 +25,7 @@
 # CHECK-NEXT: alignment:
 # CHECK-NEXT: exposesReturnsTwice: false
 # CHECK-NEXT: hasInlineAsm: false
-# CHECK-NEXT: ...
+# CHECK: ...
 name:            foo
 ...
 ---
@@ -33,7 +33,7 @@
 # CHECK-NEXT: alignment:
 # CHECK-NEXT: exposesReturnsTwice: false
 # CHECK-NEXT: hasInlineAsm: false
-# CHECK-NEXT: ...
+# CHECK: ...
 name:            bar
 ...
 ---
@@ -41,7 +41,7 @@
 # CHECK-NEXT: alignment: 8
 # CHECK-NEXT: exposesReturnsTwice: false
 # CHECK-NEXT: hasInlineAsm: false
-# CHECK-NEXT: ...
+# CHECK: ...
 name:            func
 alignment:       8
 ...
@@ -50,7 +50,7 @@
 # CHECK-NEXT: alignment: 16
 # CHECK-NEXT: exposesReturnsTwice: true
 # CHECK-NEXT: hasInlineAsm: true
-# CHECK-NEXT: ...
+# CHECK: ...
 name:            func2
 alignment:       16
 exposesReturnsTwice: true