Improve error checking for unsized arrays.

Added support for resolving dimensions of multi-dimensional unsized arrays
from their initializer exprerssions (previously, only the first dimension
would be resolved.)

Added checks to make sure that no unsized array dimensions remain after
doing this (except for the first dimensision of array parameters to
functions.)

tests_errors/decl-4.ispc

@@ -1,4 +1,4 @@
-// Can't declare an unsized array as a local variable without providing an initializer expression to set its size
+// Illegal to declare an unsized array variable without providing an initializer expression to set its size
 
 int func() {
     int a[];

tests_errors/initexpr-2.ispc

@@ -0,0 +1,3 @@
+// Initializer list for array "int32[2][4]" must have 2 elements (has 3). 
+
+int a[2][4] = { { 1, 2, 3 }, { 1, 2, 3, 4 }, 1 };

tests_errors/initexpr-3.ispc

@@ -0,0 +1,6 @@
+// Inconsistent expression list lengths found in initializer list
+
+void foo() {
+    int a[2][] = { { 1, 2, 3 }, { 1, 2, 3, 4 } };
+}
+

tests_errors/initexpr-4.ispc

@@ -0,0 +1,4 @@
+// Illegal to declare an unsized array variable without providing an initializer expression to set its size
+
+void foo() { int a[][]; }
+

tests_errors/initexpr-6.ispc

@@ -0,0 +1,4 @@
+// Illegal to declare a global variable with unsized array dimensions that aren't set with an initializer expression
+
+int a[][];
+

tests_errors/initexpr.ispc

@@ -0,0 +1,3 @@
+// Initializer list for array "int32[4]" must have 4 elements
+
+int a[2][4] = { { 1, 2, 3 }, { 1, 2, 3, 4 } };

tests_errors/unsized-funcparam.ispc

@@ -0,0 +1,4 @@
+// Arrays with unsized dimensions in dimensions after the first one are illegal in function parameter lists
+
+void func(int a[1][]) {
+}