Pdb: Fix missing marker for locations on Windows

When parsing the file path of location information the
GdbMi parser expects UNIX-style formatted paths.
When debugging with the pdb on Windows we reported
Windows-style paths which in turn made the parser fail
and the stack never contained a file name and the
current location also had never a marker displayed.

Change-Id: I5216bbaf39ceead63efe8426561f132de3cd04a2
Reviewed-by: hjk <hjk@qt.io>

share/qtcreator/debugger/pdbbridge.py

@@ -36,6 +36,7 @@ import inspect
 import traceback
 import linecache
 import fnmatch
+import platform
 
 class QuitException(Exception):
     pass
@@ -248,6 +249,8 @@ class Dumper:
         if not canonic:
             canonic = os.path.abspath(filename)
             canonic = os.path.normcase(canonic)
+            if platform.system() in ('Microsoft', 'Windows'):
+                canonic = canonic.replace('\\', '/')
             self.fncache[filename] = canonic
         return canonic