Wrong generated method sequence point ranges

There is a significant issue in `hwTokenFetch` generation, which makes it very hard, or almost impossible, to debug this function.
https://github.com/dotnet/fsharp/blob/c4ad09a4c68c7a86e3d101b1c2c7e93e47637262/src/Compiler/SyntaxTree/LexFilter.fs#L1217

According to the pdb information, the last sequence point in this method has range at this `when` condition:
https://github.com/dotnet/fsharp/blob/c4ad09a4c68c7a86e3d101b1c2c7e93e47637262/src/Compiler/SyntaxTree/LexFilter.fs#L1985

Here's a [dump](https://gist.github.com/ArseniiCherniaev/c02d89ea208eb060a697f5bdfd5709f6) of sequence points read from the pdb, look for `100718728` metadata token.

Stepping any further in this method is impossible because the debugger can't match subsequent sequence points to the method. Neither Visual Studio, nor Rider can debug this method properly.