Accept /fsanitize=address as a passthrough option for MSVC

[randombit]

At the moment, invocations using /fsanitize=address are rejected as uncachable by sccache due to it assuming there are multiple input files.

[codecov-commenter]

Codecov Report

Base: 30.00% // Head: 30.03% // Increases project coverage by +0.03% 🎉

Coverage data is based on head (0f12915) compared to base (0d62517).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1518      +/-   ##
==========================================
+ Coverage   30.00%   30.03%   +0.03%     
==========================================
  Files          47       47              
  Lines       16643    16643              
  Branches     7907     7907              
==========================================
+ Hits         4994     4999       +5     
  Misses       6313     6313              
+ Partials     5336     5331       -5     

Impacted Files	Coverage Δ
src/compiler/msvc.rs	43.29% <ø> (ø)
src/mock_command.rs	50.93% <0.00%> (-1.50%)	⬇️
src/cache/disk.rs	35.61% <0.00%> (-1.37%)	⬇️
src/lib.rs	9.26% <0.00%> (ø)
src/util.rs	34.09% <0.00%> (ø)
src/compiler/c.rs	38.49% <0.00%> (ø)
src/compiler/rust.rs	33.46% <0.00%> (+0.13%)	⬆️
src/compiler/args.rs	61.55% <0.00%> (+0.17%)	⬆️
src/server.rs	31.72% <0.00%> (+0.21%)	⬆️
src/compiler/gcc.rs	54.54% <0.00%> (+0.41%)	⬆️
... and 1 more

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[randombit]

FreeBSD CI build is failing but afaict it is not related to this change