Reduced skslc memory consumption

tests/SkSLErrorTest.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkSLCompiler.h"
 
 #include "Test.h"
@@ skipping 25 matching lines @@
 
 DEF_TEST(SkSLUndefinedFunction, r) {
     test_failure(r,
                  "void main() { int x = foo(1); }", 
                  "error: 1: unknown identifier 'foo'\n1 error\n");
 }
 
 DEF_TEST(SkSLGenericArgumentMismatch, r) {
     test_failure(r,
                  "void main() { float x = sin(1, 2); }", 
-                 "error: 1: no match for sin(int, int)\n1 error\n");
+                 "error: 1: call to 'sin' expected 1 argument, but found 2\n1 error\n");
+    test_failure(r,
+                 "void main() { float x = sin(true); }", 
+                 "error: 1: no match for sin(bool)\n1 error\n");
+    test_success(r,
+                 "void main() { float x = sin(1); }");
 }
 
 DEF_TEST(SkSLArgumentCountMismatch, r) {
     test_failure(r,
                  "float foo(float x) { return x * x; }"
                  "void main() { float x = foo(1, 2); }", 
                  "error: 1: call to 'foo' expected 1 argument, but found 2\n1 error\n");
 }
 
 DEF_TEST(SkSLArgumentMismatch, r) {
@@ skipping 277 matching lines @@
     test_failure(r,
                  "void foo() { while(true) {} if (true) break; }",
                  "error: 1: break statement must be inside a loop\n1 error\n");
 }
 
 DEF_TEST(SkSLContinueOutsideLoop, r) {
     test_failure(r,
                  "void foo() { for(;;); continue; }",
                  "error: 1: continue statement must be inside a loop\n1 error\n");
 }