Update irbuild-str.test

Author: BobTheBuidler

mypyc/test-data/irbuild-str.test

@@ -613,13 +613,15 @@ integer: Final = 123
 floating: Final = 3.14
 
 def test(x: str) -> str:
-    return f"{string}{integer}{floating}{x}"
+    return f"{string}{integer}{floating}{x}{floating}{integer}{string}{x}{string}{integer}{floating}{x}"
 
 [out]
 def test(x):
-    x, r0, r1 :: str
+    x, r0, r1, r2, r3 :: str
 
 L0:
     r0 = 'abc1233.14'
-    r1 = CPyStr_Build(2, r0, x)
-    return r1
+    r1 = '3.14123abc'
+    r2 = 'abc1233.14'
+    r3 = CPyStr_Build(2, r0, x, r1, x, r2)
+    return r3