Refactor ARM subarchitecture parsing

According to a FIXME in ARMMCTargetDesc.cpp the ARM version parsing should be
in the Triple helper class.

Patch by: Gabor Ballabas

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212479 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/ADT/Triple.h

@@ -78,6 +78,22 @@ public:
     spir,       // SPIR: standard portable IR for OpenCL 32-bit version
     spir64      // SPIR: standard portable IR for OpenCL 64-bit version
   };
+  enum SubArchType {
+    NoSubArch,
+
+    ARMSubArch_v8,
+    ARMSubArch_v7,
+    ARMSubArch_v7em,
+    ARMSubArch_v7m,
+    ARMSubArch_v7s,
+    ARMSubArch_v6,
+    ARMSubArch_v6m,
+    ARMSubArch_v6t2,
+    ARMSubArch_v5,
+    ARMSubArch_v5te,
+    ARMSubArch_v4t,
+    ARMSubArch_v4
+  };
   enum VendorType {
     UnknownVendor,
 
@@ -148,6 +164,9 @@ private:
   /// The parsed arch type.
   ArchType Arch;
 
+  /// The parsed subarchitecture type.
+  SubArchType SubArch;
+
   /// The parsed vendor type.
   VendorType Vendor;
 
@@ -190,6 +209,9 @@ public:
   /// getArch - Get the parsed architecture type of this triple.
   ArchType getArch() const { return Arch; }
 
+  /// getSubArch - get the parsed subarchitecture type for this triple.
+  SubArchType getSubArch() const { return SubArch; }
+
   /// getVendor - Get the parsed vendor type of this triple.
   VendorType getVendor() const { return Vendor; }