[optimizing compiler] Add CMP{L,G}_{FLOAT,DOUBLE}

Adds:
- float comparison for arm, x86, x86_64 backends.
- ucomis{s,d} assembly to x86 and x86_64.
- vmstat assebmly for thumb2
- new assembly tests

Change-Id: Ie3e19d0c08b3b875cd0a4be4ee4e9c8a4a076290
diff --git a/compiler/utils/arm/assembler_thumb2_test.cc b/compiler/utils/arm/assembler_thumb2_test.cc
index 65d6d45..6ae95a4 100644
--- a/compiler/utils/arm/assembler_thumb2_test.cc
+++ b/compiler/utils/arm/assembler_thumb2_test.cc
@@ -30,7 +30,7 @@
   }
 
   std::string GetAssemblerParameters() OVERRIDE {
-    return " -mthumb";
+    return " -mthumb -mfpu=neon";
   }
 
   std::string GetDisassembleParameters() OVERRIDE {
@@ -156,4 +156,12 @@
   DriverStr(expected, "ubfx");
 }
 
+TEST_F(AssemblerThumb2Test, Vmstat) {
+  GetAssembler()->vmstat();
+
+  const char* expected = "vmrs APSR_nzcv, FPSCR\n";
+
+  DriverStr(expected, "vmrs");
+}
+
 }  // namespace art