ADT: correctly report isMSVCEnvironment for windows itanium

The itanium environment on Windows uses MSVC and is a MSVC environment.  Report
this correctly.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222180 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/ADT/Triple.h

@@ -371,6 +371,7 @@ public:
   bool isWindowsMSVCEnvironment() const {
     return getOS() == Triple::Win32 &&
            (getEnvironment() == Triple::UnknownEnvironment ||
+            getEnvironment() == Triple::Itanium ||
             getEnvironment() == Triple::MSVC);
   }
 

lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp

@@ -221,7 +221,7 @@ static MCAsmInfo *createARMMCAsmInfo(const MCRegisterInfo &MRI, StringRef TT) {
     MAI = new ARMMCAsmInfoDarwin(TT);
   else if (TheTriple.isWindowsItaniumEnvironment())
     MAI = new ARMCOFFMCAsmInfoGNU();
-  else if (TheTriple.isWindowsMSVCEnvironment())
+  else if (TheTriple.isKnownWindowsMSVCEnvironment())
     MAI = new ARMCOFFMCAsmInfoMicrosoft();
   else
     MAI = new ARMELFMCAsmInfo(TT);

lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp

@@ -270,7 +270,7 @@ static MCAsmInfo *createX86MCAsmInfo(const MCRegisterInfo &MRI, StringRef TT) {
   } else if (TheTriple.isOSBinFormatELF()) {
     // Force the use of an ELF container.
     MAI = new X86ELFMCAsmInfo(TheTriple);
-  } else if (TheTriple.isWindowsMSVCEnvironment()) {
+  } else if (TheTriple.isKnownWindowsMSVCEnvironment()) {
     MAI = new X86MCAsmInfoMicrosoft(TheTriple);
   } else if (TheTriple.isOSCygMing() ||
              TheTriple.isWindowsItaniumEnvironment()) {