Fix GCC 4.7 warnings, which are related to char being signed in GCC

("narrowing conversion ... inside { } is ill-formed in C++11").

* src/mksnapshot.cc: Cast "char" to "unsigned char" when outputting snapshot.
* test/cctest/test-regexp.cc: Use static_cast to uc16 as the char
literal is signed.

Review URL: http://codereview.chromium.org/8825003
Patch from Tobias Burnus <burnus@net-b.de>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10241 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

AUTHORS

@@ -42,6 +42,7 @@ Rodolph Perfetta <rodolph.perfetta@arm.com>
 Ryan Dahl <coldredlemur@gmail.com>
 Sanjoy Das <sanjoy@playingwithpointers.com>
 Subrato K De <subratokde@codeaurora.org>
+Tobias Burnus <burnus@net-b.de>
 Vlad Burlik <vladbph@gmail.com>
 Yuqiang Xian <yuqiang.xian@intel.com>
 Zaheer Ahmad <zahmad@codeaurora.org>

src/mksnapshot.cc

@@ -109,7 +109,7 @@ class PartialSnapshotSink : public i::SnapshotByteSink {
       if (j != 0) {
         fprintf(fp, ",");
       }
-      fprintf(fp, "%d", at(j));
+      fprintf(fp, "%u", static_cast<unsigned char>(at(j)));
     }
   }
   char at(int i) { return data_[i]; }

test/cctest/test-regexp.cc

@@ -836,7 +836,8 @@ TEST(MacroAssemblerNativeSimpleUC16) {
   Handle<Code> code = Handle<Code>::cast(code_object);
 
   int captures[4] = {42, 37, 87, 117};
-  const uc16 input_data[6] = {'f', 'o', 'o', 'f', 'o', '\xa0'};
+  const uc16 input_data[6] = {'f', 'o', 'o', 'f', 'o',
+                              static_cast<uc16>('\xa0')};
   Handle<String> input =
       factory->NewStringFromTwoByte(Vector<const uc16>(input_data, 6));
   Handle<SeqTwoByteString> seq_input = Handle<SeqTwoByteString>::cast(input);
@@ -856,7 +857,8 @@ TEST(MacroAssemblerNativeSimpleUC16) {
   CHECK_EQ(-1, captures[2]);
   CHECK_EQ(-1, captures[3]);
 
-  const uc16 input_data2[9] = {'b', 'a', 'r', 'b', 'a', 'r', 'b', 'a', '\xa0'};
+  const uc16 input_data2[9] = {'b', 'a', 'r', 'b', 'a', 'r', 'b', 'a',
+                               static_cast<uc16>('\xa0')};
   input = factory->NewStringFromTwoByte(Vector<const uc16>(input_data2, 9));
   seq_input = Handle<SeqTwoByteString>::cast(input);
   start_adr = seq_input->GetCharsAddress();