Short-term workaround for frame-related weirdness on win64.
Some other minor win64 fixes as well.

Patch by Michael Beck!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80370 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86JITInfo.cpp b/lib/Target/X86/X86JITInfo.cpp
index 5c3d101..d36f87a 100644
--- a/lib/Target/X86/X86JITInfo.cpp
+++ b/lib/Target/X86/X86JITInfo.cpp
@@ -23,7 +23,7 @@
 using namespace llvm;
 
 // Determine the platform we're running on
-#if defined (__x86_64__) || defined (_M_AMD64)
+#if defined (__x86_64__) || defined (_M_AMD64) || defined (_M_X64)
 # define X86_64_JIT
 #elif defined(__i386__) || defined(i386) || defined(_M_IX86)
 # define X86_32_JIT