Added match or-pattern branch coverage test

Author: ranger-ross

tests/coverage/branch/match-or-pattern-simple.cov-map

@@ -0,0 +1,25 @@
+Function name: match_or_pattern_simple::foo
+Raw bytes (50): 0x[01, 01, 06, 01, 07, 05, 09, 09, 05, 05, 02, 09, 17, 05, 02, 06, 01, 08, 01, 01, 17, 20, 02, 0b, 02, 09, 00, 0a, 20, 05, 09, 00, 0d, 00, 0e, 17, 00, 12, 02, 0a, 09, 03, 0e, 02, 0a, 13, 04, 01, 00, 02]
+Number of files: 1
+- file 0 => global file 1
+Number of expressions: 6
+- expression 0 operands: lhs = Counter(0), rhs = Expression(1, Add)
+- expression 1 operands: lhs = Counter(1), rhs = Counter(2)
+- expression 2 operands: lhs = Counter(2), rhs = Counter(1)
+- expression 3 operands: lhs = Counter(1), rhs = Expression(0, Sub)
+- expression 4 operands: lhs = Counter(2), rhs = Expression(5, Add)
+- expression 5 operands: lhs = Counter(1), rhs = Expression(0, Sub)
+Number of file 0 mappings: 6
+- Code(Counter(0)) at (prev + 8, 1) to (start + 1, 23)
+- Branch { true: Expression(0, Sub), false: Expression(2, Add) } at (prev + 2, 9) to (start + 0, 10)
+    true  = (c0 - (c1 + c2))
+    false = (c2 + c1)
+- Branch { true: Counter(1), false: Counter(2) } at (prev + 0, 13) to (start + 0, 14)
+    true  = c1
+    false = c2
+- Code(Expression(5, Add)) at (prev + 0, 18) to (start + 2, 10)
+    = (c1 + (c0 - (c1 + c2)))
+- Code(Counter(2)) at (prev + 3, 14) to (start + 2, 10)
+- Code(Expression(4, Add)) at (prev + 4, 1) to (start + 0, 2)
+    = (c2 + (c1 + (c0 - (c1 + c2))))
+

tests/coverage/branch/match-or-pattern-simple.coverage

@@ -0,0 +1,34 @@
+   LL|       |#![feature(coverage_attribute)]
+   LL|       |//@ edition: 2021
+   LL|       |//@ compile-flags: -Zcoverage-options=branch
+   LL|       |//@ llvm-cov-flags: --show-branches=count
+   LL|       |
+   LL|       |use core::hint::black_box;
+   LL|       |
+   LL|      3|fn foo(a: i32) {
+   LL|      3|    match black_box(a) {
+   LL|      1|        1 | 2 => {
+  ------------------
+  |  Branch (LL:9): [True: 1, False: 2]
+  |  Branch (LL:13): [True: 0, False: 2]
+  ------------------
+   LL|      1|            consume(1);
+   LL|      1|        }
+   LL|      2|        _ => {
+   LL|      2|            consume(2);
+   LL|      2|        }
+   LL|       |    }
+   LL|      3|}
+   LL|       |
+   LL|       |#[coverage(off)]
+   LL|       |fn consume<T>(x: T) {
+   LL|       |    core::hint::black_box(x);
+   LL|       |}
+   LL|       |
+   LL|       |#[coverage(off)]
+   LL|       |fn main() {
+   LL|       |    foo(1);
+   LL|       |    foo(3);
+   LL|       |    foo(4);
+   LL|       |}
+

tests/coverage/branch/match-or-pattern-simple.rs

@@ -0,0 +1,29 @@
+#![feature(coverage_attribute)]
+//@ edition: 2021
+//@ compile-flags: -Zcoverage-options=branch
+//@ llvm-cov-flags: --show-branches=count
+
+use core::hint::black_box;
+
+fn foo(a: i32) {
+    match black_box(a) {
+        1 | 2 => {
+            consume(1);
+        }
+        _ => {
+            consume(2);
+        }
+    }
+}
+
+#[coverage(off)]
+fn consume<T>(x: T) {
+    core::hint::black_box(x);
+}
+
+#[coverage(off)]
+fn main() {
+    foo(1);
+    foo(3);
+    foo(4);
+}