code review 12519044: runtime: change int32 to intgo in maxstring and concatstring

src/pkg/runtime/runtime.h

 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 /*
  * basic types
  */
 typedef signed char             int8;
 typedef unsigned char           uint8;
 typedef signed short            int16;
@@ skipping 688 matching lines @@
 extern  M*      runtime·allm;
 extern  P**     runtime·allp;
 extern  int32   runtime·gomaxprocs;
 extern  uint32  runtime·needextram;
 extern  uint32  runtime·panicking;
 extern  uint32  runtime·gcwaiting;              // gc is waiting to run
 extern  int8*   runtime·goos;
 extern  int32   runtime·ncpu;
 extern  bool    runtime·iscgo;
 extern  void    (*runtime·sysargs)(int32, uint8**);
-extern  uint32  runtime·maxstring;
+extern  uintptr runtime·maxstring;
 extern  uint32  runtime·Hchansize;
 extern  uint32  runtime·cpuid_ecx;
 extern  uint32  runtime·cpuid_edx;
 extern  DebugVars       runtime·debug;
 
 /*
  * common functions and data
  */
 int32   runtime·strcmp(byte*, byte*);
 byte*   runtime·strstr(byte*, byte*);
@@ skipping 329 matching lines @@
 extern float64 runtime·neginf;
 extern uint64 ·nan;
 extern uint64 ·posinf;
 extern uint64 ·neginf;
 #define ISNAN(f) ((f) != (f))
 
 enum
 {
         UseSpanType = 1,
 };