tests: tolerate wrapped constexpr diagnostics

Split FileCheck patterns into smaller tokens so messages match across line-wrapping variants.

Author: dbabokin

tests/lit-tests/constexpr-aggregate-errors.ispc

@@ -14,16 +14,22 @@ constexpr uniform int<2> bad_swizzle_char = v2.qy;
 constexpr uniform int<2> bad_swizzle_oob = v2.zw;
 
 // CHECK: Error:
-// CHECK: Initializer list for array
+// CHECK: Initializer list
+// CHECK: for array
 // CHECK: "const uniform int32[2]"
 // CHECK: must have
 // CHECK: no more
-// CHECK: than 2 elements (has 3).
+// CHECK: than 2
+// CHECK: elements
+// CHECK: (has 3).
 // CHECK: Error:
-// CHECK: Initializer list for struct
+// CHECK: Initializer list
+// CHECK: for struct
 // CHECK: "const uniform struct Pair"
 // CHECK: must
 // CHECK: have no
-// CHECK: more than 2 elements (has 3).
+// CHECK: more than 2
+// CHECK: elements
+// CHECK: (has 3).
 // CHECK: identifier "qy" unknown.
 // CHECK: character 'z' for constexpr vector.

tests/lit-tests/constexpr-errors.ispc

@@ -15,15 +15,19 @@ constexpr uniform int badstmt(uniform int x) {
 
 // CHECK: Error:
 // CHECK: Initializer
-// CHECK: for global variable "badinit" must be a constant.
+// CHECK: for global
+// CHECK: variable "badinit" must be a constant.
 // CHECK: Error:
 // CHECK: Missing
-// CHECK: initializer for constexpr variable "noinit".
+// CHECK: initializer for
+// CHECK: constexpr variable "noinit".
 // CHECK: Error:
 // CHECK: constexpr
-// CHECK: function "badcall" calls non-constexpr function
+// CHECK: function
+// CHECK: "badcall" calls non-constexpr function
 // CHECK: "nonconstexpr".
 // CHECK: Error:
 // CHECK: constexpr
-// CHECK: function "badstmt" contains disallowed statement
+// CHECK: function
+// CHECK: "badstmt" contains disallowed statement
 // CHECK: "print".