tests: re-enable test/Interpreter/protocol_initializers.swift for linux

And update Jira link for test/stdlib/ErrorHandling.swift

Author: Erik Eckstein

test/Interpreter/protocol_initializers.swift

@@ -4,9 +4,6 @@
 // RUN: %target-run %t/a.out
 // REQUIRES: executable_test
 
-// FIXME: <https://bugs.swift.org/browse/SR-7138> 2 tests are failing on linux in optimized mode
-// UNSUPPORTED: OS=linux-gnu
-
 import StdlibUnittest
 
 var ProtocolInitTestSuite = TestSuite("ProtocolInit")

test/stdlib/ErrorHandling.swift

@@ -1,7 +1,7 @@
 // RUN: %target-run-simple-swift
 // REQUIRES: executable_test
 
-// FIXME: <https://bugs.swift.org/browse/SR-7138> 2 tests are failing on linux in optimized mode
+// FIXME: <https://bugs.swift.org/browse/SR-7146> 2 tests are failing on linux in optimized mode
 // UNSUPPORTED: OS=linux-gnu
 
 //