Remove some RUNlines from a flang test

This flang has been a dummy for roughly a month now -- the test coverage
through the extra RUN lines made sense in the past, but now it's redundant.

Author: jmorse

flang/test/Integration/debug-local-var-2.f90

@@ -1,6 +1,5 @@
-! RUN: %flang_fc1 -emit-llvm -debug-info-kind=standalone %s -mllvm --experimental-debuginfo-iterators=true -o - | FileCheck %s --check-prefixes=BOTH,RECORDS
-! RUN: %flang_fc1 -emit-llvm -debug-info-kind=line-tables-only %s -mllvm --experimental-debuginfo-iterators=false -o - | FileCheck --check-prefix=LINEONLY %s
-! RUN: %flang_fc1 -emit-llvm -debug-info-kind=line-tables-only %s -mllvm --experimental-debuginfo-iterators=true -o - | FileCheck --check-prefix=LINEONLY %s
+! RUN: %flang_fc1 -emit-llvm -debug-info-kind=standalone %s -o - | FileCheck %s --check-prefixes=BOTH,RECORDS
+! RUN: %flang_fc1 -emit-llvm -debug-info-kind=line-tables-only %s -o - | FileCheck --check-prefix=LINEONLY %s
 
 ! This tests checks the debug information for local variables in llvm IR.