More fixes to access and buffer compilation.

test/parse/arithmetic_parens.golden

@@ -0,0 +1,5 @@
+(program	
+ (fun vertex vs_main
+  [] 
+  (:= v float2) 
+  (= v.x (* (+ 2 (* (- 4 2) 1.5)) 3))))

test/parse/bad_double_access.golden

@@ -0,0 +1,8 @@
+(program	
+ (struct P
+  [(:= v float2)])
+
+ (fun vertex vs_main
+  [] 
+  (:= p P) 
+  (= p.v.x.y 2)))

test/parse/buffers.golden

@@ -0,0 +1,10 @@
+(program	
+ (buffer property_buffer
+  [(:= color float4)])
+
+ (constant_buffer cbuffer
+  [(:= color float4)])
+
+ (fun pixel ps_main
+  [(:= index int)] 
+  (return property_buffer[index].color)))

test/parse/double_access.golden

@@ -0,0 +1,7 @@
+(program	
+ (constant_buffer p
+  [(:= v float2)])
+
+ (fun vertex vs_main
+  [] 
+  (:= x float (/ p.v.x p.v.y))))