[PATCH] Pedantically rename all Tool subclasses to be nouns, not verbs. NFC

[Chandler Carruth]

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Comment at: lib/Driver/Tools.h:170
@@ -171,1 +169,3 @@
+    Compiler(const ToolChain &TC)
+        : Common("gcc::Compile", "gcc frontend", TC) {}
 
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Above you renamed "gcc::Preprocess" to "gcc::Preprocessor", but here (and almost everywhere else in my spot check) the text names were left alone.

I'm not actually sure which is right. These seem like documentation or logging generation strings, so maybe they should all be updated?

http://reviews.llvm.org/D10595

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