fix: recent pypy3.9 now omits lines after jumps

We were seeing these failures in the nightly builds:

```
FAILED tests/test_arcs.py::LoopArcTest::test_continue - AssertionError:
  Possible arcs differ: minus is expected, plus is actual
    (-1, 1) # .1
    (1, 2) # 12
    (1, 5) # 15
    (2, 3) # 23
    (3, 1) # 31
  - (4, 1) # 41
    (5, -1) # 5.

  Missing arcs differ: minus is expected, plus is actual
  - (4, 1) # 41
  +

assert False
FAILED tests/test_arcs.py::LoopArcTest::test_break - AssertionError:
  Possible arcs differ: minus is expected, plus is actual
    (-1, 1) # .1
    (1, 2) # 12
    (1, 5) # 15
    (2, 3) # 23
    (3, 5) # 35
  - (4, 1) # 41
    (5, -1) # 5.

  Missing arcs differ: minus is expected, plus is actual
    (1, 5) # 15
  - (4, 1) # 41

assert False
FAILED tests/test_arcs.py::ExceptionArcTest::test_raise_followed_by_statement - AssertionError:
  Possible arcs differ: minus is expected, plus is actual
    (-1, 1) # .1
    (1, 2) # 12
    (2, 3) # 23
    (3, 4) # 34
    (4, 6) # 46
  - (5, 8) # 58
    (6, 7) # 67
    (7, 8) # 78
    (8, -1) # 8.

  Missing arcs differ: minus is expected, plus is actual
  - (5, 8) # 58
  +

assert False
FAILED tests/test_coverage.py::SimpleStatementTest::test_raise_followed_by_statement - AssertionError: [1, 2, 4, 5] != [1, 2, 3, 4, 5]
assert [1, 2, 4, 5] == [1, 2, 3, 4, 5]
  At index 2 diff: 4 != 3
  Right contains one more item: 5
  Full diff:
  - [1, 2, 3, 4, 5]
  ?        ---
  + [1, 2, 4, 5]
FAILED tests/test_coverage.py::SimpleStatementTest::test_break - AssertionError: [1, 2, 3, 5] != [1, 2, 3, 4, 5]
assert [1, 2, 3, 5] == [1, 2, 3, 4, 5]
  At index 3 diff: 5 != 4
  Right contains one more item: 5
  Full diff:
  - [1, 2, 3, 4, 5]
  ?           ---
  + [1, 2, 3, 5]
FAILED tests/test_coverage.py::SimpleStatementTest::test_continue - AssertionError: [1, 2, 3, 5] != [1, 2, 3, 4, 5]
assert [1, 2, 3, 5] == [1, 2, 3, 4, 5]
  At index 3 diff: 5 != 4
  Right contains one more item: 5
  Full diff:
  - [1, 2, 3, 4, 5]
  ?           ---
  + [1, 2, 3, 5]
```

Author: nedbat

coverage/env.py

@@ -106,11 +106,17 @@ class PYBEHAVIOR:
 
     # Lines after break/continue/return/raise are no longer compiled into the
     # bytecode.  They used to be marked as missing, now they aren't executable.
-    omit_after_jump = pep626
+    omit_after_jump = (
+        pep626
+        or (PYPY and PYVERSION >= (3, 9) and PYPYVERSION >= (7, 3, 12))
+    )
 
     # PyPy has always omitted statements after return.
     omit_after_return = omit_after_jump or PYPY
 
+    # Optimize away unreachable try-else clauses.
+    optimize_unreachable_try_else = pep626
+
     # Modules used to have firstlineno equal to the line number of the first
     # real line of code.  Now they always start at 1.
     module_firstline_1 = pep626

tests/test_coverage.py

@@ -1121,7 +1121,7 @@ def test_try_except(self) -> None:
         )
 
     def test_try_except_stranded_else(self) -> None:
-        if env.PYBEHAVIOR.omit_after_jump:
+        if env.PYBEHAVIOR.optimize_unreachable_try_else:
             # The else can't be reached because the try ends with a raise.
             lines = [1,2,3,4,5,6,9]
             missing = ""
@@ -1498,7 +1498,7 @@ def test_excluding_try_except(self) -> None:
         )
 
     def test_excluding_try_except_stranded_else(self) -> None:
-        if env.PYBEHAVIOR.omit_after_jump:
+        if env.PYBEHAVIOR.optimize_unreachable_try_else:
             # The else can't be reached because the try ends with a raise.
             arcz = ".1 12 23 34 45 56 69 9."
             arcz_missing = ""
@@ -1801,7 +1801,7 @@ def test_try_except_finally(self) -> None:
         )
 
     def test_try_except_finally_stranded_else(self) -> None:
-        if env.PYBEHAVIOR.omit_after_jump:
+        if env.PYBEHAVIOR.optimize_unreachable_try_else:
             # The else can't be reached because the try ends with a raise.
             lines = [1,2,3,4,5,6,10,11]
             missing = ""