Update kernel base to work for non-KASLR kernels.

[gmarin13]

Replace an existing check for "start >= loadSegment.Vaddr" with "start >= 0x8000000000000000".

The old condition was checking for the mapping start address to be greater or equal to the program segment Vaddr. However, for kernels without KASLR, the mapping start address (start) is less or equal the program header Vaddr. If the program header that includes the '.text' section is not the first segment, then the mapping start is strictly less than loadSegment.Vaddr.

Instead of removing the condition, we replace it with a check that start is in the kernel address space, so we don't take this path for user space binaries.

Adjusted the test case for PIE kernels to match actual addresses seen for a non-KASLR kernel. The new test fails with the old code and succeeds now.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.95%. Comparing base (0ed6a68) to head (a28ad78).
Report is 47 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #904      +/-   ##
==========================================
+ Coverage   66.86%   66.95%   +0.09%     
==========================================
  Files          44       44              
  Lines        9824     9857      +33     
==========================================
+ Hits         6569     6600      +31     
- Misses       2794     2817      +23     
+ Partials      461      440      -21     

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