Use C++ comments for large block comment.

llvm-svn: 273526
diff --git a/llvm/lib/Target/PowerPC/PPC.td b/llvm/lib/Target/PowerPC/PPC.td
index c66e855..b40b530 100644
--- a/llvm/lib/Target/PowerPC/PPC.td
+++ b/llvm/lib/Target/PowerPC/PPC.td
@@ -37,14 +37,16 @@
 def DirectiveA2  : SubtargetFeature<"", "DarwinDirective", "PPC::DIR_A2", "">;
 def DirectiveE500mc : SubtargetFeature<"", "DarwinDirective",
                                        "PPC::DIR_E500mc", "">;
-def DirectiveE5500  : SubtargetFeature<"", "DarwinDirective", 
+def DirectiveE5500  : SubtargetFeature<"", "DarwinDirective",
                                        "PPC::DIR_E5500", "">;
 def DirectivePwr3: SubtargetFeature<"", "DarwinDirective", "PPC::DIR_PWR3", "">;
 def DirectivePwr4: SubtargetFeature<"", "DarwinDirective", "PPC::DIR_PWR4", "">;
 def DirectivePwr5: SubtargetFeature<"", "DarwinDirective", "PPC::DIR_PWR5", "">;
-def DirectivePwr5x: SubtargetFeature<"", "DarwinDirective", "PPC::DIR_PWR5X", "">;
+def DirectivePwr5x
+    : SubtargetFeature<"", "DarwinDirective", "PPC::DIR_PWR5X", "">;
 def DirectivePwr6: SubtargetFeature<"", "DarwinDirective", "PPC::DIR_PWR6", "">;
-def DirectivePwr6x: SubtargetFeature<"", "DarwinDirective", "PPC::DIR_PWR6X", "">;
+def DirectivePwr6x
+    : SubtargetFeature<"", "DarwinDirective", "PPC::DIR_PWR6X", "">;
 def DirectivePwr7: SubtargetFeature<"", "DarwinDirective", "PPC::DIR_PWR7", "">;
 def DirectivePwr8: SubtargetFeature<"", "DarwinDirective", "PPC::DIR_PWR8", "">;
 def DirectivePwr9: SubtargetFeature<"", "DarwinDirective", "PPC::DIR_PWR9", "">;
@@ -168,20 +170,19 @@
                                         [FeatureISA3_0, FeatureP8Vector,
                                          FeatureP9Altivec]>;
 
-/*  Since new processors generally contain a superset of features of those that
-    came before them, the idea is to make implementations of new processors
-    less error prone and easier to read.
-    Namely:
-        list<SubtargetFeature> Power8FeatureList = ...
-        list<SubtargetFeature> FutureProcessorSpecificFeatureList =
-            [ features that Power8 does not support ]
-        list<SubtargetFeature> FutureProcessorFeatureList =
-            !listconcat(Power8FeatureList, FutureProcessorSpecificFeatureList)
+// Since new processors generally contain a superset of features of those that
+// came before them, the idea is to make implementations of new processors
+// less error prone and easier to read.
+// Namely:
+//     list<SubtargetFeature> Power8FeatureList = ...
+//     list<SubtargetFeature> FutureProcessorSpecificFeatureList =
+//         [ features that Power8 does not support ]
+//     list<SubtargetFeature> FutureProcessorFeatureList =
+//         !listconcat(Power8FeatureList, FutureProcessorSpecificFeatureList)
 
-    Makes it explicit and obvious what is new in FutureProcesor vs. Power8 as
-    well as providing a single point of definition if the feature set will be
-    used elsewhere.
-*/
+// Makes it explicit and obvious what is new in FutureProcesor vs. Power8 as
+// well as providing a single point of definition if the feature set will be
+// used elsewhere.
 def ProcessorFeatures {
   list<SubtargetFeature> Power7FeatureList =
       [DirectivePwr7, FeatureAltivec, FeatureVSX,