[PATCH] PR19958 wrong code at -O1 and above on x86_64-linux-gnu (InstCombine)

[suyog]

Hi Duncan, Nick

As there is no guidance in the coding standards,
i looked at few files in InstCombine and comment style in them and
i found it better to include braces, wherever there is a comment inside 'if'.

if ( ) {
// comment
}

I removed/didn't add braces where there is no comment and a single statement block.

Please see if this looks good to you !!

http://reviews.llvm.org/D4068

Files:
  lib/Transforms/InstCombine/InstCombine.h
  lib/Transforms/InstCombine/InstCombineCompares.cpp
  test/Transforms/InstCombine/icmp-shr.ll
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