[llvm] [Dexter] Only increment step index if we record the step (PR #156832)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- cross-project-tests/debuginfo-tests/dexter/feature_tests/commands/control/dex-continue.cpp cross-project-tests/debuginfo-tests/dexter/feature_tests/commands/control/dex_step_function.cpp
``````````

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``````````diff
diff --git a/cross-project-tests/debuginfo-tests/dexter/feature_tests/commands/control/dex-continue.cpp b/cross-project-tests/debuginfo-tests/dexter/feature_tests/commands/control/dex-continue.cpp
index 2d5cbe045..9adad5578 100644
--- a/cross-project-tests/debuginfo-tests/dexter/feature_tests/commands/control/dex-continue.cpp
+++ b/cross-project-tests/debuginfo-tests/dexter/feature_tests/commands/control/dex-continue.cpp
@@ -52,13 +52,20 @@ int main() {
 // DexStepFunction('f')
 
 // CHECK:      ## BEGIN ##
-// CHECK-NEXT: .   [0, "a(int)", "{{.*}}dex-continue.cpp", 31, 3, "StopReason.BREAKPOINT", "StepKind.FUNC", []]
-// CHECK-NEXT: .   [1, "a(int)", "{{.*}}dex-continue.cpp", 32, 5, "StopReason.STEP", "StepKind.VERTICAL_FORWARD", []]
-// CHECK-NEXT: .   .   .   [2, "c(int)", "{{.*}}dex-continue.cpp", 16, 3, "StopReason.BREAKPOINT", "StepKind.FUNC", []]
-// CHECK-NEXT: .   .   .   [3, "c(int)", "{{.*}}dex-continue.cpp", 17, 3, "StopReason.BREAKPOINT", "StepKind.VERTICAL_FORWARD", []]
-// CHECK-NEXT: .   .   .   [4, "c(int)", "{{.*}}dex-continue.cpp", 19, 3, "StopReason.BREAKPOINT", "StepKind.VERTICAL_FORWARD", []]
-// CHECK-NEXT: .   .   .   [5, "c(int)", "{{.*}}dex-continue.cpp", 20, 3, "StopReason.BREAKPOINT", "StepKind.VERTICAL_FORWARD", []]
-// CHECK-NEXT: .   [6, "a(int)", "{{.*}}dex-continue.cpp", 33, 3, "StopReason.BREAKPOINT", "StepKind.VERTICAL_FORWARD", []]
-// CHECK-NEXT: .   [7, "f()", "{{.*}}dex-continue.cpp", 38, 3, "StopReason.BREAKPOINT", "StepKind.VERTICAL_FORWARD", []]
-// CHECK-NEXT: .   [8, "f()", "{{.*}}dex-continue.cpp", 39, 1, "StopReason.STEP", "StepKind.VERTICAL_FORWARD", []]
-// CHECK-NEXT: ## END (9 steps) ##
+// CHECK-NEXT: .   [0, "a(int)", "{{.*}}dex-continue.cpp", 31, 3,
+// "StopReason.BREAKPOINT", "StepKind.FUNC", []] CHECK-NEXT: .   [1, "a(int)",
+// "{{.*}}dex-continue.cpp", 32, 5, "StopReason.STEP",
+// "StepKind.VERTICAL_FORWARD", []] CHECK-NEXT: .   .   .   [2, "c(int)",
+// "{{.*}}dex-continue.cpp", 16, 3, "StopReason.BREAKPOINT", "StepKind.FUNC",
+// []] CHECK-NEXT: .   .   .   [3, "c(int)", "{{.*}}dex-continue.cpp", 17, 3,
+// "StopReason.BREAKPOINT", "StepKind.VERTICAL_FORWARD", []] CHECK-NEXT: .   .
+// .   [4, "c(int)", "{{.*}}dex-continue.cpp", 19, 3, "StopReason.BREAKPOINT",
+// "StepKind.VERTICAL_FORWARD", []] CHECK-NEXT: .   .   .   [5, "c(int)",
+// "{{.*}}dex-continue.cpp", 20, 3, "StopReason.BREAKPOINT",
+// "StepKind.VERTICAL_FORWARD", []] CHECK-NEXT: .   [6, "a(int)",
+// "{{.*}}dex-continue.cpp", 33, 3, "StopReason.BREAKPOINT",
+// "StepKind.VERTICAL_FORWARD", []] CHECK-NEXT: .   [7, "f()",
+// "{{.*}}dex-continue.cpp", 38, 3, "StopReason.BREAKPOINT",
+// "StepKind.VERTICAL_FORWARD", []] CHECK-NEXT: .   [8, "f()",
+// "{{.*}}dex-continue.cpp", 39, 1, "StopReason.STEP",
+// "StepKind.VERTICAL_FORWARD", []] CHECK-NEXT: ## END (9 steps) ##
diff --git a/cross-project-tests/debuginfo-tests/dexter/feature_tests/commands/control/dex_step_function.cpp b/cross-project-tests/debuginfo-tests/dexter/feature_tests/commands/control/dex_step_function.cpp
index 900e10b64..7a8fe6143 100644
--- a/cross-project-tests/debuginfo-tests/dexter/feature_tests/commands/control/dex_step_function.cpp
+++ b/cross-project-tests/debuginfo-tests/dexter/feature_tests/commands/control/dex_step_function.cpp
@@ -31,9 +31,13 @@ int main() {
 // DexStepFunction('c')
 
 // CHECK:      ## BEGIN ##
-// CHECK-NEXT:.   [0, "a(int)", "{{.*}}dex_step_function.cpp", 22, 3, "StopReason.BREAKPOINT", "StepKind.FUNC", []]
-// CHECK-NEXT:.   [1, "a(int)", "{{.*}}dex_step_function.cpp", 23, 12, "StopReason.STEP", "StepKind.VERTICAL_FORWARD", []]
-// CHECK-NEXT:.   .   .   [2, "c(int)", "{{.*}}dex_step_function.cpp", 12, 3, "StopReason.BREAKPOINT", "StepKind.FUNC", []]
-// CHECK-NEXT:.   .   .   [3, "c(int)", "{{.*}}dex_step_function.cpp", 13, 3, "StopReason.STEP", "StepKind.VERTICAL_FORWARD", []]
-// CHECK-NEXT:.   [4, "a(int)", "{{.*}}dex_step_function.cpp", 23, 3, "StopReason.STEP", "StepKind.HORIZONTAL_BACKWARD", []]
-// CHECK-NEXT: ## END (5 steps) ##
+// CHECK-NEXT:.   [0, "a(int)", "{{.*}}dex_step_function.cpp", 22, 3,
+// "StopReason.BREAKPOINT", "StepKind.FUNC", []] CHECK-NEXT:.   [1, "a(int)",
+// "{{.*}}dex_step_function.cpp", 23, 12, "StopReason.STEP",
+// "StepKind.VERTICAL_FORWARD", []] CHECK-NEXT:.   .   .   [2, "c(int)",
+// "{{.*}}dex_step_function.cpp", 12, 3, "StopReason.BREAKPOINT",
+// "StepKind.FUNC", []] CHECK-NEXT:.   .   .   [3, "c(int)",
+// "{{.*}}dex_step_function.cpp", 13, 3, "StopReason.STEP",
+// "StepKind.VERTICAL_FORWARD", []] CHECK-NEXT:.   [4, "a(int)",
+// "{{.*}}dex_step_function.cpp", 23, 3, "StopReason.STEP",
+// "StepKind.HORIZONTAL_BACKWARD", []] CHECK-NEXT: ## END (5 steps) ##

``````````

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https://github.com/llvm/llvm-project/pull/156832