Auto merge of #108417 - Zoxc:dep-graph-branch, r=cjgillot

Move dep graph methods to DepGraphData to avoid branches and `unwrap`s

This moves methods from `DepGraph` to `DepGraphData` which makes the code a bit cleaner since the dep graph is unconditionally available. It also changes `try_execute_query` to only branch on dep graph availability once, removing unnecessary branches and `unwrap`s.

This is based on #108134 and #108167.

Performance impact of just the last commit:
<table><tr><td rowspan="2">Benchmark</td><td colspan="1"><b>Before</b></th><td colspan="2"><b>After</b></th></tr><tr><td align="right">Time</td><td align="right">Time</td><td align="right">%</th></tr><tr><td>🟣 <b>clap</b>:check</td><td align="right">1.7354s</td><td align="right">1.7242s</td><td align="right"> -0.64%</td></tr><tr><td>🟣 <b>clap</b>:check:initial</td><td align="right">2.0813s</td><td align="right">2.0687s</td><td align="right"> -0.61%</td></tr><tr><td>🟣 <b>clap</b>:check:unchanged</td><td align="right">0.4554s</td><td align="right">0.4550s</td><td align="right"> -0.09%</td></tr><tr><td>🟣 <b>hyper</b>:check</td><td align="right">0.2528s</td><td align="right">0.2521s</td><td align="right"> -0.27%</td></tr><tr><td>🟣 <b>hyper</b>:check:initial</td><td align="right">0.3222s</td><td align="right">0.3214s</td><td align="right"> -0.25%</td></tr><tr><td>🟣 <b>hyper</b>:check:unchanged</td><td align="right">0.1339s</td><td align="right">0.1333s</td><td align="right"> -0.38%</td></tr><tr><td>🟣 <b>regex</b>:check</td><td align="right">0.9484s</td><td align="right">0.9455s</td><td align="right"> -0.30%</td></tr><tr><td>🟣 <b>regex</b>:check:initial</td><td align="right">1.1805s</td><td align="right">1.1727s</td><td align="right"> -0.66%</td></tr><tr><td>🟣 <b>regex</b>:check:unchanged</td><td align="right">0.3305s</td><td align="right">0.3307s</td><td align="right"> 0.08%</td></tr><tr><td>🟣 <b>syn</b>:check</td><td align="right">1.5453s</td><td align="right">1.5374s</td><td align="right"> -0.51%</td></tr><tr><td>🟣 <b>syn</b>:check:initial</td><td align="right">1.9230s</td><td align="right">1.9206s</td><td align="right"> -0.12%</td></tr><tr><td>🟣 <b>syn</b>:check:unchanged</td><td align="right">0.6340s</td><td align="right">0.6333s</td><td align="right"> -0.11%</td></tr><tr><td>🟣 <b>syntex_syntax</b>:check</td><td align="right">5.8623s</td><td align="right">5.8536s</td><td align="right"> -0.15%</td></tr><tr><td>🟣 <b>syntex_syntax</b>:check:initial</td><td align="right">7.2873s</td><td align="right">7.2786s</td><td align="right"> -0.12%</td></tr><tr><td>🟣 <b>syntex_syntax</b>:check:unchanged</td><td align="right">1.8378s</td><td align="right">1.8478s</td><td align="right"> 0.54%</td></tr><tr><td>Total</td><td align="right">26.5300s</td><td align="right">26.4750s</td><td align="right"> -0.21%</td></tr><tr><td>Summary</td><td align="right">1.0000s</td><td align="right">0.9976s</td><td align="right"> -0.24%</td></tr></table>

r? `@cjgillot`

Author: bors