Reduced skslc memory consumption

src/sksl/SkSLContext.h

Index: src/sksl/SkSLContext.h
diff --git a/src/sksl/SkSLContext.h b/src/sksl/SkSLContext.h
index e652948499b42e3873f06e6cedf8b6d4db8d95b2..7a0f826479e88c7d8bf5bb299cb955a1da836a4d 100644
--- a/src/sksl/SkSLContext.h
+++ b/src/sksl/SkSLContext.h
@@ -110,9 +110,12 @@ public:
     , fGVec2_Type(new Type("$gvec2"))
     , fGVec3_Type(new Type("$gvec3"))
     , fGVec4_Type(new Type("$gvec4", static_type(*fVec4_Type)))
-    , fDVec_Type(new Type("$dvec"))
-    , fIVec_Type(new Type("$ivec"))
-    , fUVec_Type(new Type("$uvec"))
+    , fDVec_Type(new Type("$dvec", { fDVec2_Type.get(), fDVec2_Type.get(), fDVec3_Type.get(),

[dogben, 2016/10/25 13:56:50]

Is it allowed/supported to use a $genType (or $gen[DIUB]Type) in the same
declaration as $vec (or $[diub]vec)?

If yes, ISTM that the first coercible type for $[diub]?vec (any others?) should
be the invalid type. Otherwise if I have a function declaration like
$genType foo($vec a, $genType b);
then I will never be able to call it like
foo(vec2(1, 2), vec2(3, 4))
because determineFinalTypes will choose index 0 rather than index 1.

+                                     fDVec4_Type.get() }))
+    , fIVec_Type(new Type("$ivec", { fIVec2_Type.get(), fIVec2_Type.get(), fIVec3_Type.get(),
+                                     fIVec4_Type.get() }))
+    , fUVec_Type(new Type("$uvec", { fUVec2_Type.get(), fUVec2_Type.get(), fUVec3_Type.get(),
+                                     fUVec4_Type.get() }))
     , fBVec_Type(new Type("$bvec", { fBVec2_Type.get(), fBVec2_Type.get(), fBVec3_Type.get(), 
                                      fBVec4_Type.get() }))
     , fInvalid_Type(new Type("<INVALID>"))