Memory Allocation in Codegen and Other Analysis Tabs

3rd chunk of `src/profiling/wpa_profiling.md`

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In this sample, you can see calls through codegen are allocating ~30gb of memory in total
throughout this profile.

## Other Analysis Tabs

The profile also includes a few other tabs which can be helpful:

- System Configuration
    - General information about the system the capture was recorded on.
- rustc Build Processes
    - A flat list of relevant processes such as rustc.exe, cargo.exe, link.exe etc.
    - Each process lists its command line arguments.
    - Useful for figuring out what a specific rustc process was working on.
- rustc Build Process Tree
    - Timeline showing when processes started and exited.
- rustc CPU Analysis
    - Contains charts preconfigured to show hotspots in rustc.
    - These charts are designed to support analyzing where rustc is spending its time.
- rustc Memory Analysis
    - Contains charts preconfigured to show where rustc is allocating memory.

Title: Memory Allocation in Codegen and Other Analysis Tabs

Summary

The example profile shows that calls through codegen are allocating approximately 30 GB of memory. The document then lists other tabs in the WPA profile that can be helpful for analyzing Rust performance, including System Configuration, rustc Build Processes, rustc Build Process Tree, rustc CPU Analysis, and rustc Memory Analysis.