Added p2998 (compiler-explorer#7175)

See:

* compiler-explorer/clang-builder#77
* compiler-explorer/compiler-workflows#30
* compiler-explorer/infra#1472

Author: Bekenn

CONTRIBUTORS.md

@@ -150,3 +150,4 @@ From oldest to newest contributor, we would like to thank:
 - [Nicholas Hubbard](https://github.com/nhubbard)
 - [Detjon Mataj](https://github.com/detjonmataj)
 - [Pierre Bayerl](https://github.com/goto40)
+- [James Touton](https://github.com/Bekenn)

etc/config/c++.amazon.properties

@@ -423,7 +423,7 @@ compiler.clang1910.ldPath=${exePath}/../lib|${exePath}/../lib/x86_64-unknown-lin
 compiler.clang1910.debugPatched=true
 
 
-group.clangx86trunk.compilers=clang_trunk:clang_assertions_trunk:clang_concepts:clang_p1144:clang_autonsdmi:clang_bb_p2996:clang_p3068:clang_p3309:clang_p3367:clang_p3372:clang_p3412:clang_lifetime:clang_p1061:clang_parmexpr:clang_patmat:clang_embed:clang_dang:clang_reflection:clang_variadic_friends:clang_widberg:clang_resugar:clang_clangir:clang_dascandy_contracts:clang_ericwf_contracts:clang_p1974
+group.clangx86trunk.compilers=clang_trunk:clang_assertions_trunk:clang_concepts:clang_p1144:clang_autonsdmi:clang_bb_p2996:clang_p2998:clang_p3068:clang_p3309:clang_p3367:clang_p3372:clang_p3412:clang_lifetime:clang_p1061:clang_parmexpr:clang_patmat:clang_embed:clang_dang:clang_reflection:clang_variadic_friends:clang_widberg:clang_resugar:clang_clangir:clang_dascandy_contracts:clang_ericwf_contracts:clang_p1974
 group.clangx86trunk.intelAsm=-mllvm --x86-asm-syntax=intel
 group.clangx86trunk.options=--gcc-toolchain=/opt/compiler-explorer/gcc-snapshot
 group.clangx86trunk.objdumper=/opt/compiler-explorer/gcc-snapshot/bin/objdump
@@ -466,6 +466,10 @@ compiler.clang_bb_p2996.exe=/opt/compiler-explorer/clang-bb-p2996-trunk/bin/clan
 compiler.clang_bb_p2996.semver=(experimental P2996)
 compiler.clang_bb_p2996.notification=Experimental Reflection Support; see <a href="https://github.com/bloomberg/clang-p2996/blob/p2996/P2996.md" target="_blank" rel="noopener noreferrer">P2996<sup><small class="fas fa-external-link-alt opens-new-window" title="Opens in a new window"></small></sup></a>
 compiler.clang_bb_p2996.options=-std=c++26 -freflection -stdlib=libc++
+compiler.clang_p2998.exe=/opt/compiler-explorer/clang-p2998-trunk/bin/clang++
+compiler.clang_p2998.semver=(experimental P2998)
+compiler.clang_p2998.notification=Experimental support for additional template argument deduction from a function call; see <a href="https://github.com/Bekenn/llvm-project/tree/p2998" target="_blank" rel="noopener noreferrer">P2998<sup><small class="fas fa-external-link-alt opens-new-window" title="Opens in a new window"></small></sup></a>
+compiler.clang_p2998.options=-p2998
 compiler.clang_p3068.exe=/opt/compiler-explorer/clang-p3068-trunk/bin/clang++
 compiler.clang_p3068.semver=(experimental P3068)
 compiler.clang_p3068.notification=Experimental constexpr Exception Support; see <a href="https://github.com/hanickadot/llvm-project/tree/P3068-constexpr-exceptions" target="_blank" rel="noopener noreferrer">P3068<sup><small class="fas fa-external-link-alt opens-new-window" title="Opens in a new window"></small></sup></a>