runtime: increase stack system space on windows/amd64

gotest src/pkg/exp/template/html was crashing because the exception handler overflowed the goroutine stack.

R=alex.brainman, golang-dev
CC=golang-dev
https://golang.org/cl/5031049

diff --git a/src/pkg/runtime/stack.h b/src/pkg/runtime/stack.h
index 44d5533f456a64c3433ee15db21b5c4d6034fdd5..483233876a5f4c3400cf37daa2e76e65a461b216 100644 (file)
--- a/src/pkg/runtime/stack.h
+++ b/src/pkg/runtime/stack.h
@@ -58,7 +58,7 @@ enum {
        // purposes like signal handling. Used on Windows because
        // it does not use a separate stack.
 #ifdef __WINDOWS__
-       StackSystem = 2048,
+       StackSystem = 512 * sizeof(uintptr),
 #else
        StackSystem = 0,
 #endif