[ADT] Recognize ppc as valid architecture in target triple.

[JDevlieghere]

Summary

Until this patch, only powerpc and ppc32 were recognized as valid
PowerPC 32-bit architectures in a target triple. This was incompatible
with the triple ppc-apple-darwin as returned for libObject. I found
out about this when working on a test case using a binary generated on
an old PowerBook G4.

We had the choice of either fix this in the Mach-O object parser or
in the Triple implementation. I chose the latter because it feels like
the most canonical place.

[davide]

LGTM.

llvm/trunk/lib/Support/Triple.cpp

 }
 
 static Triple::ArchType parseArch(StringRef ArchName) {
   auto AT = StringSwitch<Triple::ArchType>(ArchName)
     .Cases("i386", "i486", "i586", "i686", Triple::x86)
     // FIXME: Do we need to support these?
     .Cases("i786", "i886", "i986", Triple::x86)
     .Cases("amd64", "x86_64", "x86_64h", Triple::x86_64)
-    .Cases("powerpc", "ppc32", Triple::ppc)
+    .Cases("powerpc", "ppc", "ppc32", Triple::ppc)
     .Cases("powerpc64", "ppu", "ppc64", Triple::ppc64)
     .Cases("powerpc64le", "ppc64le", Triple::ppc64le)
     .Case("xscale", Triple::arm)
     .Case("xscaleeb", Triple::armeb)
     .Case("aarch64", Triple::aarch64)
     .Case("aarch64_be", Triple::aarch64_be)
     .Case("arc", Triple::arc)
     .Case("arm64", Triple::aarch64)

llvm/trunk/unittests/ADT/TripleTest.cpp

TEST(TripleTest, ParsedIDs) {
   EXPECT_EQ(Triple::UnknownEnvironment, T.getEnvironment());
 
   T = Triple("powerpc-bgp-cnk");
   EXPECT_EQ(Triple::ppc, T.getArch());
   EXPECT_EQ(Triple::BGP, T.getVendor());
   EXPECT_EQ(Triple::CNK, T.getOS());
   EXPECT_EQ(Triple::UnknownEnvironment, T.getEnvironment());
 
+  T = Triple("ppc-bgp-linux");
+  EXPECT_EQ(Triple::ppc, T.getArch());
+  EXPECT_EQ(Triple::BGP, T.getVendor());
+  EXPECT_EQ(Triple::Linux, T.getOS());
+  EXPECT_EQ(Triple::UnknownEnvironment, T.getEnvironment());
+
+  T = Triple("ppc32-bgp-linux");
+  EXPECT_EQ(Triple::ppc, T.getArch());
+  EXPECT_EQ(Triple::BGP, T.getVendor());
+  EXPECT_EQ(Triple::Linux, T.getOS());
+  EXPECT_EQ(Triple::UnknownEnvironment, T.getEnvironment());
+
   T = Triple("powerpc64-bgq-linux");
   EXPECT_EQ(Triple::ppc64, T.getArch());
   EXPECT_EQ(Triple::BGQ, T.getVendor());
   EXPECT_EQ(Triple::Linux, T.getOS());
   EXPECT_EQ(Triple::UnknownEnvironment, T.getEnvironment());
 
+  T = Triple("ppc64-bgq-linux");
+  EXPECT_EQ(Triple::ppc64, T.getArch());
+  EXPECT_EQ(Triple::BGQ, T.getVendor());
+  EXPECT_EQ(Triple::Linux, T.getOS());
+
   T = Triple("powerpc-ibm-aix");
   EXPECT_EQ(Triple::ppc, T.getArch());
   EXPECT_EQ(Triple::IBM, T.getVendor());
   EXPECT_EQ(Triple::AIX, T.getOS());
   EXPECT_EQ(Triple::UnknownEnvironment, T.getEnvironment());
 
   T = Triple("powerpc64-ibm-aix");
   EXPECT_EQ(Triple::ppc64, T.getArch());