add equality for strings

compiler/builtins/bitcode/src/main.zig

@@ -23,6 +23,7 @@ comptime {
     exportStrFn(str.strConcatC, "concat");
     exportStrFn(str.strNumberOfBytes, "number_of_bytes");
     exportStrFn(str.strFromIntC, "from_int");
+    exportStrFn(str.strEqual, "equal");
 }
 
 // Export helpers - Must be run inside a comptime

compiler/builtins/bitcode/src/str.zig

@@ -260,6 +260,11 @@ pub const RocStr = extern struct {
     }
 };
 
+// Str.equal
+pub fn strEqual(self: RocStr, other: RocStr) callconv(.C) bool {
+    return self.eq(other);
+}
+
 // Str.numberOfBytes
 pub fn strNumberOfBytes(string: RocStr) callconv(.C) usize {
     return string.len();