Fix white space matching in latin-1 strings wrt \u00a0.

src/x64/regexp-macro-assembler-x64.cc

Index: src/x64/regexp-macro-assembler-x64.cc
diff --git a/src/x64/regexp-macro-assembler-x64.cc b/src/x64/regexp-macro-assembler-x64.cc
index f5b5e954ad3bb9f3ba97641df73859473504a4b3..c9871f0e47326352ca7a61331c36127c9b083292 100644
--- a/src/x64/regexp-macro-assembler-x64.cc
+++ b/src/x64/regexp-macro-assembler-x64.cc
@@ -640,29 +640,23 @@ bool RegExpMacroAssemblerX64::CheckSpecialCharacterClass(uc16 type,
   case 's':
     // Match space-characters
     if (mode_ == ASCII) {
-      // ASCII space characters are '\t'..'\r' and ' '.
+      // One byte space characters are '\t'..'\r', ' ' and \u00a0.
       Label success;
       __ cmpl(current_character(), Immediate(' '));
-      __ j(equal, &success);
+      __ j(equal, &success, Label::kNear);
       // Check range 0x09..0x0d
       __ lea(rax, Operand(current_character(), -'\t'));
       __ cmpl(rax, Immediate('\r' - '\t'));
-      BranchOrBacktrack(above, on_no_match);
+      __ j(below_equal, &success, Label::kNear);
+      // \u00a0 (NBSP).
+      __ cmpl(rax, Immediate(0x00a0 - '\t'));
+      BranchOrBacktrack(not_equal, on_no_match);
       __ bind(&success);
       return true;
     }
     return false;
   case 'S':
-    // Match non-space characters.
-    if (mode_ == ASCII) {
-      // ASCII space characters are '\t'..'\r' and ' '.
-      __ cmpl(current_character(), Immediate(' '));
-      BranchOrBacktrack(equal, on_no_match);
-      __ lea(rax, Operand(current_character(), -'\t'));
-      __ cmpl(rax, Immediate('\r' - '\t'));
-      BranchOrBacktrack(below_equal, on_no_match);
-      return true;
-    }
+    // The emitted code for generic character classes is good enough.
     return false;
   case 'd':
     // Match ASCII digits ('0'..'9')