For some symbols, `gd` jumps to a wrong location several seconds after jumping to the correct definition.

Describe the bug
For some symbols, 'gd' jumps to the end of the file containing the real definition. Following c-o will jump back to the beginning of the file.

To Reproduce
Steps to reproduce the behavior:

1. Navigate to a symbol (I'm browsing C++ code) and press 'gd' to jump to the definition.
2. Cursor will jump to the definition correctly.
3. Wait for about 3 seconds without any further inputs, the cursor will then jump to the end of the file.
4. Press c-o will jump to the beginning of the file.
5. Press c-o again will jump back to the end of the file.
6. Press c-o the third time will jump back to where 'gd' is issued.

Expected behavior
F12 and Alt+Left Arrow works correctly. 'gd' and c-o should jump to the correct locations.

Screenshots
If applicable, add screenshots to help explain your problem.
If remapping-related, please attach log output: https://github.com/VSCodeVim/Vim#debugging-remappings.

Environment (please complete the following information):

• Extension (VsCodeVim) version: 1.8.1
• VSCode version: 1.35.0 - insider / 1.34.0
• OS: Win10 64

Additional context
Add any other context about the problem here.

Here is the log in the developers console when I hit the bug:
[Extension Host] ModeHandler: debug: handling key=g.
workbench.main.js:238 [Extension Host] Remapper: debug: trying to find matching remap. keys=g. mode=Normal. keybindings=normalModeKeyBindingsMap.
workbench.main.js:238 [Extension Host] Remapper: debug: trying to find matching remap. keys=g. mode=Normal. keybindings=normalModeKeyBindingsNonRecursiveMap.
workbench.main.js:238 [Extension Host] ModeHandler: debug: handling key=d.
workbench.main.js:238 [Extension Host] Remapper: debug: trying to find matching remap. keys=d. mode=Normal. keybindings=normalModeKeyBindingsMap.
workbench.main.js:238 [Extension Host] Remapper: debug: trying to find matching remap. keys=d. mode=Normal. keybindings=normalModeKeyBindingsNonRecursiveMap.
workbench.main.js:238 [Extension Host] VimState: warn: invalid cursor position. [ [2555, 56] | [2555, 56]].
workbench.main.js:238 [Extension Host] VimState: warn: invalid cursor start position. [2555, 56].
workbench.main.js:238 [Extension Host] ModeHandler: debug: handling key=.
workbench.main.js:238 [Extension Host] Remapper: debug: trying to find matching remap. keys=. mode=Normal. keybindings=normalModeKeyBindingsMap.
workbench.main.js:238 [Extension Host] Remapper: debug: trying to find matching remap. keys=. mode=Normal. keybindings=normalModeKeyBindingsNonRecursiveMap.
workbench.main.js:238 [Extension Host] ModeHandler: debug: handling key=.
workbench.main.js:238 [Extension Host] Remapper: debug: trying to find matching remap. keys=. mode=Normal. keybindings=normalModeKeyBindingsMap.
workbench.main.js:238 [Extension Host] Remapper: debug: trying to find matching remap. keys=. mode=Normal. keybindings=normalModeKeyBindingsNonRecursiveMap.
workbench.main.js:238 [Extension Host] VimState: warn: invalid cursor stop position. [2555, 56].
workbench.main.js:238 [Extension Host] VimState: warn: invalid cursor start position. [2555, 56].
workbench.main.js:238 [Extension Host] ModeHandler: debug: handling key=.
workbench.main.js:238 [Extension Host] Remapper: debug: trying to find matching remap. keys=. mode=Normal. keybindings=normalModeKeyBindingsMap.
workbench.main.js:238 [Extension Host] Remapper: debug: trying to find matching remap. keys=. mode=Normal. keybindings=normalModeKeyBindingsNonRecursiveMap.
workbench.main.js:238 [Extension Host] getCursorsAfterSync: warn: getCursorsAfterSync: selection not updated within 0ms.

[2555,56] is acutally the line and column where I pressed 'gd'. The first warning is triggered about 3 seconds after the cursor jumps to the correct location.

Reproduce the delayed jump using gd on a C++ symbol, then inspect the gd and c-o handling associated with the logged invalid cursor positions. Done means the cursor remains at the correct definition after the delay and c-o returns through the expected locations without invalid-position warnings.