Revert "irtest"

This reverts commit 7345e20.

Author: BobTheBuidler

mypyc/test-data/irbuild-constant-fold.test

@@ -186,25 +186,6 @@ L0:
     big5 = r4
     return 1
 
-[case testConstantFoldFormatArgs]
-# This only tests that the callee and args are constant folded,
-# it is not intended to test the result.
-from typing import Any, Final
-
-FMT: Final = "{:d} {}"
-
-def f() -> str:
-    return FMT.format(400 + 20, "roll" + "up")
-[out]
-def f():
-    r0, r1, r2, r3 :: str
-L0:
-    r0 = '420'
-    r1 = ' '
-    r2 = 'rollup'
-    r3 = CPyStr_Build(3, r0, r1, r2)
-    return r3
-
 [case testIntConstantFoldingFinal]
 from typing import Final
 X: Final = 5