Add OpenEmbedded vendor

[mgrang]

Summary

The lib paths are not correctly picked up for OpenEmbedded sysroots (like arm-oe-linux-gnueabi). I fix this in a follow-up clang patch. But in order to add the correct libs I need to detect if the vendor is oe. For this reason, it is first necessary to teach llvm to detect oe vendor, which is what this patch does.

[mgrang]

Here is the follow-up clang patch: D48862

include/llvm/ADT/Triple.h

enum VendorType {
     ImaginationTechnologies,
     MipsTechnologies,
     NVIDIA,
     CSR,
     Myriad,
     AMD,
     Mesa,
     SUSE,
-    LastVendorType = SUSE
+    OpenEmbedded,
+    LastVendorType = OpenEmbedded
   };
   enum OSType {
     UnknownOS,
 
     Ananas,
     CloudABI,
     Darwin,
     DragonFly,

lib/Support/Triple.cpp

StringRef Triple::getVendorTypeName(VendorType Kind) {
   case ImaginationTechnologies: return "img";
   case MipsTechnologies: return "mti";
   case NVIDIA: return "nvidia";
   case CSR: return "csr";
   case Myriad: return "myriad";
   case AMD: return "amd";
   case Mesa: return "mesa";
   case SUSE: return "suse";
+  case OpenEmbedded: return "oe";
   }
 
   llvm_unreachable("Invalid VendorType!");
 }
 
 StringRef Triple::getOSTypeName(OSType Kind) {
   switch (Kind) {
   case UnknownOS: return "unknown";
return StringSwitch<Triple::VendorType>(VendorName)
     .Case("img", Triple::ImaginationTechnologies)
     .Case("mti", Triple::MipsTechnologies)
     .Case("nvidia", Triple::NVIDIA)
     .Case("csr", Triple::CSR)
     .Case("myriad", Triple::Myriad)
     .Case("amd", Triple::AMD)
     .Case("mesa", Triple::Mesa)
     .Case("suse", Triple::SUSE)
+    .Case("oe", Triple::OpenEmbedded)
     .Default(Triple::UnknownVendor);
 }
 
 static Triple::OSType parseOS(StringRef OSName) {
   return StringSwitch<Triple::OSType>(OSName)
     .StartsWith("ananas", Triple::Ananas)
     .StartsWith("cloudabi", Triple::CloudABI)
     .StartsWith("darwin", Triple::Darwin)

unittests/ADT/TripleTest.cpp

TEST(TripleTest, ParsedIDs) {
   EXPECT_EQ(Triple::GNUABIN32, T.getEnvironment());
 
   T = Triple("mips64el-unknown-linux-gnuabi64");
   EXPECT_EQ(Triple::mips64el, T.getArch());
   EXPECT_EQ(Triple::UnknownVendor, T.getVendor());
   EXPECT_EQ(Triple::Linux, T.getOS());
   EXPECT_EQ(Triple::GNUABI64, T.getEnvironment());
 
+  T = Triple("arm-oe-linux-gnueabi");
+  EXPECT_EQ(Triple::arm, T.getArch());
+  EXPECT_EQ(Triple::OpenEmbedded, T.getVendor());
+  EXPECT_EQ(Triple::Linux, T.getOS());
+  EXPECT_EQ(Triple::GNUEABI, T.getEnvironment());
+
   T = Triple("huh");
   EXPECT_EQ(Triple::UnknownArch, T.getArch());
 }
 
 static std::string Join(StringRef A, StringRef B, StringRef C) {
   std::string Str = A; Str += '-'; Str += B; Str += '-'; Str += C;
   return Str;
 }