Fuse long and FP compare & condition on ARM in Optimizing.

Also:
- Stylistic changes in corresponding parts on the x86 and
  x86-64 code generators.
- Update and improve the documentation of
  art::arm::Condition.

Bug: 21120453
Change-Id: If144772046e7d21362c3c2086246cb7d011d49ce
diff --git a/compiler/optimizing/instruction_simplifier.h b/compiler/optimizing/instruction_simplifier.h
index faee2dd..cc4b6f6 100644
--- a/compiler/optimizing/instruction_simplifier.h
+++ b/compiler/optimizing/instruction_simplifier.h
@@ -31,7 +31,7 @@
   InstructionSimplifier(HGraph* graph,
                         OptimizingCompilerStats* stats = nullptr,
                         const char* name = kInstructionSimplifierPassName)
-    : HOptimization(graph, name, stats) {}
+      : HOptimization(graph, name, stats) {}
 
   static constexpr const char* kInstructionSimplifierPassName = "instruction_simplifier";