[Test] Underscored simplify_cfg_simplify_term_with_identical_dest_blocks.

Use underscores rather than hyphens so that text editors understand the
name as a single word.

Author: nate-chandler

lib/SILOptimizer/Transforms/SimplifyCFG.cpp

@@ -2665,7 +2665,7 @@ namespace swift::test {
 /// Dumps:
 /// - nothing
 static FunctionTest SimplifyCFGSimplifyTermWithIdenticalDestBlocks(
-    "simplify-cfg-simplify-term-with-identical-dest-blocks",
+    "simplify_cfg_simplify_term_with_identical_dest_blocks",
     [](auto &function, auto &arguments, auto &test) {
       auto *passToRun = cast<SILFunctionTransform>(createSimplifyCFG());
       passToRun->injectPassManager(test.getPassManager());

test/SILOptimizer/simplify_cfg_ossa_simplify_branch.sil

@@ -58,7 +58,7 @@ enum E1<T> {
 // CHECK-LABEL: } // end sil function 'test_simplify_term_with_identical_dest_blocks1'
 sil [ossa] @test_simplify_term_with_identical_dest_blocks1 : $@convention(thin) (@owned Klass) -> () {
 bb0(%0 : @owned $Klass):
-  specify_test "simplify-cfg-simplify-term-with-identical-dest-blocks @block[0]"
+  specify_test "simplify_cfg_simplify_term_with_identical_dest_blocks @block[0]"
   %1 = begin_borrow %0 : $Klass
   br bb1(%1 : $Klass)
 
@@ -79,7 +79,7 @@ bb2(%5 : @guaranteed $Klass):
 // CHECK-LABEL: } // end sil function 'test_simplify_term_with_identical_dest_blocks2'
 sil [ossa] @test_simplify_term_with_identical_dest_blocks2 : $@convention(thin) (@owned Klass) -> () {
 bb0(%0 : @owned $Klass):
-  specify_test "simplify-cfg-simplify-term-with-identical-dest-blocks @block[0]"
+  specify_test "simplify_cfg_simplify_term_with_identical_dest_blocks @block[0]"
   br bb1(%0 : $Klass)
 
 bb1(%3 : @owned $Klass):