cranelift: Remove duplicated clz/ctz tests (#4304)

These were interpreter only since none of the architectures supported
them but we added support for these instructions when moving to ISLE (#72e2b7fe)

cranelift/filetests/filetests/runtests/clz-interpret.clif

@@ -1,19 +0,0 @@
-test interpret
-
-function %clz_i8(i8) -> i8 {
-block0(v0: i8):
-    v1 = clz v0
-    return v1
-}
-; run: %clz_i8(1) == 7
-; run: %clz_i8(0x40) == 1
-; run: %clz_i8(-1) == 0
-
-function %clz_i16(i16) -> i16 {
-block0(v0: i16):
-    v1 = clz v0
-    return v1
-}
-; run: %clz_i16(1) == 15
-; run: %clz_i16(0x4000) == 1
-; run: %clz_i16(-1) == 0

cranelift/filetests/filetests/runtests/ctz-interpret.clif

@@ -1,19 +0,0 @@
-test interpret
-
-function %ctz_i8(i8) -> i8 {
-block0(v0: i8):
-    v1 = ctz v0
-    return v1
-}
-; run: %ctz_i8(1) == 0
-; run: %ctz_i8(0x40) == 6
-; run: %ctz_i8(-1) == 0
-
-function %ctz_i16(i16) -> i16 {
-block0(v0: i16):
-    v1 = ctz v0
-    return v1
-}
-; run: %ctz_i16(1) == 0
-; run: %ctz_i16(0x4000) == 14
-; run: %ctz_i16(-1) == 0