Refactor ExternalReference::isolate_address() to not rely on Isolate::Current().

src/ia32/regexp-macro-assembler-ia32.cc

Index: src/ia32/regexp-macro-assembler-ia32.cc
diff --git a/src/ia32/regexp-macro-assembler-ia32.cc b/src/ia32/regexp-macro-assembler-ia32.cc
index d8f2e8f0e777f1989b41e6cb3780b236b313beb6..2dbc9ab0ffd97000eaa1e3f153ff3497401fd15a 100644
--- a/src/ia32/regexp-macro-assembler-ia32.cc
+++ b/src/ia32/regexp-macro-assembler-ia32.cc
@@ -401,7 +401,7 @@ void RegExpMacroAssemblerIA32::CheckNotBackReferenceIgnoreCase(
 
     // Set isolate.
     __ mov(Operand(esp, 3 * kPointerSize),
-           Immediate(ExternalReference::isolate_address()));
+           Immediate(ExternalReference::isolate_address(masm_->isolate())));
     // Set byte_length.
     __ mov(Operand(esp, 2 * kPointerSize), ebx);
     // Set byte_offset2.
@@ -972,7 +972,7 @@ Handle<HeapObject> RegExpMacroAssemblerIA32::GetCode(Handle<String> source) {
     static const int num_arguments = 3;
     __ PrepareCallCFunction(num_arguments, ebx);
     __ mov(Operand(esp, 2 * kPointerSize),
-           Immediate(ExternalReference::isolate_address()));
+           Immediate(ExternalReference::isolate_address(masm_->isolate())));
     __ lea(eax, Operand(ebp, kStackHighEnd));
     __ mov(Operand(esp, 1 * kPointerSize), eax);
     __ mov(Operand(esp, 0 * kPointerSize), backtrack_stackpointer());