[lldb] Add amd64 ArchSpec

amd64 is used on OpenBSD.

Author: brad0

lldb/include/lldb/Utility/ArchSpec.h

@@ -215,6 +215,8 @@ class ArchSpec {
 
     eCore_x86_64_x86_64,
     eCore_x86_64_x86_64h, // Haswell enabled x86_64
+    eCore_x86_64_amd64,
+
     eCore_hexagon_generic,
     eCore_hexagon_hexagonv4,
     eCore_hexagon_hexagonv5,

lldb/source/Utility/ArchSpec.cpp

@@ -218,6 +218,9 @@ static const CoreDefinition g_core_definitions[] = {
      ArchSpec::eCore_x86_64_x86_64, "x86_64"},
     {eByteOrderLittle, 8, 1, 15, llvm::Triple::x86_64,
      ArchSpec::eCore_x86_64_x86_64h, "x86_64h"},
+    {eByteOrderLittle, 8, 1, 15, llvm::Triple::x86_64,
+     ArchSpec::eCore_x86_64_amd64, "amd64"},
+
     {eByteOrderLittle, 4, 4, 4, llvm::Triple::hexagon,
      ArchSpec::eCore_hexagon_generic, "hexagon"},
     {eByteOrderLittle, 4, 4, 4, llvm::Triple::hexagon,
@@ -1227,6 +1230,7 @@ static bool cores_match(const ArchSpec::Core core1, const ArchSpec::Core core2,
     break;
 
   case ArchSpec::eCore_x86_64_x86_64h:
+  case ArchSpec::eCore_x86_64_amd64:
     if (!enforce_exact_match) {
       try_inverse = false;
       if (core2 == ArchSpec::eCore_x86_64_x86_64)