Bug 1191884 - remove now-unnecessary check for GCC PR49911; r=glandium

This PR was fixed in the GCC 4.7 development cycle.  Since we require
GCC 4.7 now, we no longer have to check for this bug.

aclocal.m4

@@ -19,7 +19,6 @@ builtin(include, build/autoconf/mozprog.m4)dnl
 builtin(include, build/autoconf/mozheader.m4)dnl
 builtin(include, build/autoconf/mozcommonheader.m4)dnl
 builtin(include, build/autoconf/lto.m4)dnl
-builtin(include, build/autoconf/gcc-pr49911.m4)dnl
 builtin(include, build/autoconf/llvm-pr8927.m4)dnl
 builtin(include, build/autoconf/frameptr.m4)dnl
 builtin(include, build/autoconf/compiler-opts.m4)dnl

build/autoconf/gcc-pr49911.m4

@@ -1,71 +0,0 @@
-dnl This Source Code Form is subject to the terms of the Mozilla Public
-dnl License, v. 2.0. If a copy of the MPL was not distributed with this
-dnl file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-dnl Check if the compiler is gcc and has PR49911. If so
-dnl disable vrp.
-
-AC_DEFUN([MOZ_GCC_PR49911],
-[
-if test "$GNU_CC"; then
-
-AC_MSG_CHECKING(for gcc PR49911)
-ac_have_gcc_pr49911="no"
-AC_LANG_SAVE
-AC_LANG_CPLUSPLUS
-
-_SAVE_CXXFLAGS=$CXXFLAGS
-CXXFLAGS="-O2"
-AC_TRY_RUN([
-extern "C" void abort(void);
-typedef enum {
-eax,         ecx,         edx,         ebx,         esp,         ebp,
-esi,         edi     }
-RegisterID;
-union StateRemat {
-  RegisterID reg_;
-  int offset_;
-};
-static StateRemat FromRegister(RegisterID reg) {
-  StateRemat sr;
-  sr.reg_ = reg;
-  return sr;
-}
-static StateRemat FromAddress3(int address) {
-  StateRemat sr;
-  sr.offset_ = address;
-  if (address < 46 &&    address >= 0) {
-    abort();
-  }
-  return sr;
-}
-struct FrameState {
-  StateRemat dataRematInfo2(bool y, int z) {
-    if (y)         return FromRegister(RegisterID(1));
-    return FromAddress3(z);
-  }
-};
-FrameState frame;
-StateRemat x;
-__attribute__((noinline)) void jsop_setelem(bool y, int z) {
-  x = frame.dataRematInfo2(y, z);
-}
-int main(void) {
-  jsop_setelem(0, 47);
-}
-], true,
-   ac_have_gcc_pr49911="yes",
-   true)
-CXXFLAGS="$_SAVE_CXXFLAGS"
-
-AC_LANG_RESTORE
-
-if test "$ac_have_gcc_pr49911" = "yes"; then
-   AC_MSG_RESULT(yes)
-   CFLAGS="$CFLAGS -fno-tree-vrp"
-   CXXFLAGS="$CXXFLAGS -fno-tree-vrp"
-else
-   AC_MSG_RESULT(no)
-fi
-fi
-])

configure.in

@@ -2643,7 +2643,6 @@ esac
 AC_SUBST(WRAP_SYSTEM_INCLUDES)
 AC_SUBST(VISIBILITY_FLAGS)
 
-MOZ_GCC_PR49911
 MOZ_LLVM_PR8927
 
 dnl Check for __force_align_arg_pointer__ for SSE2 on gcc

js/src/aclocal.m4

@@ -18,7 +18,6 @@ builtin(include, ../../build/autoconf/mozprog.m4)dnl
 builtin(include, ../../build/autoconf/mozheader.m4)dnl
 builtin(include, ../../build/autoconf/mozcommonheader.m4)dnl
 builtin(include, ../../build/autoconf/lto.m4)dnl
-builtin(include, ../../build/autoconf/gcc-pr49911.m4)dnl
 builtin(include, ../../build/autoconf/llvm-pr8927.m4)dnl
 builtin(include, ../../build/autoconf/frameptr.m4)dnl
 builtin(include, ../../build/autoconf/compiler-opts.m4)dnl

js/src/configure.in

@@ -2158,7 +2158,6 @@ esac
 AC_SUBST(WRAP_SYSTEM_INCLUDES)
 AC_SUBST(VISIBILITY_FLAGS)
 
-MOZ_GCC_PR49911
 MOZ_LLVM_PR8927
 
 dnl Checks for header files.