Unify ART's various implementations of bit_cast.

ART had several implementations of art::bit_cast:

1. one in runtime/base/casts.h, declared as:

   template <class Dest, class Source>
   inline Dest bit_cast(const Source& source);

2. another one in runtime/utils.h, declared as:

   template<typename U, typename V>
   static inline V bit_cast(U in);

3. and a third local version, in runtime/memory_region.h,
   similar to the previous one:

   template<typename Source, typename Destination>
   static Destination MemoryRegion::local_bit_cast(Source in);

This CL removes versions 2. and 3. and changes their callers
to use 1. instead.  That version was chosen over the others
as:
- it was the oldest one in the code base; and
- its syntax was closer to the standard C++ cast operators,
  as it supports the following use:

    bit_cast<Destination>(source)

  since `Source' can be deduced from `source'.

Change-Id: I7334fd5d55bf0b8a0c52cb33cfbae6894ff83633

1 files changed, 3 insertions, 3 deletions

diff --git a/compiler/optimizing/code_generator.h b/compiler/optimizing/code_generator.h
index ecaa6f0123..07ca6b1ccf 100644
--- a/compiler/optimizing/code_generator.h
+++ b/compiler/optimizing/code_generator.h
@@ -271,7 +271,7 @@ class CodeGenerator {
       return 0;
     } else {
       DCHECK(constant->IsFloatConstant());
-      return bit_cast<float, int32_t>(constant->AsFloatConstant()->GetValue());
+      return bit_cast<int32_t, float>(constant->AsFloatConstant()->GetValue());
     }
   }
 
@@ -281,12 +281,12 @@ class CodeGenerator {
     } else if (constant->IsNullConstant()) {
       return 0;
     } else if (constant->IsFloatConstant()) {
-      return bit_cast<float, int32_t>(constant->AsFloatConstant()->GetValue());
+      return bit_cast<int32_t, float>(constant->AsFloatConstant()->GetValue());
     } else if (constant->IsLongConstant()) {
       return constant->AsLongConstant()->GetValue();
     } else {
       DCHECK(constant->IsDoubleConstant());
-      return bit_cast<double, int64_t>(constant->AsDoubleConstant()->GetValue());
+      return bit_cast<int64_t, double>(constant->AsDoubleConstant()->GetValue());
     }
   }