Add LDC 1.27.1 and make it the default compiler (compiler-explorer#2858)

* Add LDC 1.27.1 and make it the default compiler

* Update the D demangler

etc/config/d.amazon.properties

@@ -1,7 +1,7 @@
 compilers=&gdc:&ldc:&dmd
-defaultCompiler=ldc1_26
+defaultCompiler=ldc1_27
 objdumper=/opt/compiler-explorer/gcc-11.1.0/bin/objdump
-demangler=/opt/compiler-explorer/ldc1.21.0/ldc2-1.21.0-linux-x86_64/bin/ddemangle
+demangler=/opt/compiler-explorer/ldc1.27.1/ldc2-1.27.1-linux-x86_64/bin/ddemangle
 
 group.gdc.compilers=gdc48:gdc49:gdc52:gdc92:gdc93:gdc101:gdc102:gdc111:gdctrunk
 group.gdc.includeFlag=-isystem
@@ -31,7 +31,7 @@ compiler.gdctrunk.exe=/opt/compiler-explorer/gcc-snapshot/bin/gdc
 compiler.gdctrunk.objdumper=/opt/compiler-explorer/gcc-snapshot/bin/objdump
 compiler.gdctrunk.semver=(trunk)
 
-group.ldc.compilers=ldc017:ldc100:ldc110:ldc120:ldc130:ldc140:ldc150:ldc160:ldc170:ldc180:ldc190:ldc1_10:ldc1_11:ldc1_12:ldc1_13:ldc1_14:ldc1_15:ldc1_16:ldc1_17:ldc1_18:ldc1_19:ldc1_20:ldc1_21:ldc1_22:ldc1_23:ldc1_24:ldc1_25:ldc1_26:ldcbeta:ldclatestci
+group.ldc.compilers=ldc017:ldc100:ldc110:ldc120:ldc130:ldc140:ldc150:ldc160:ldc170:ldc180:ldc190:ldc1_10:ldc1_11:ldc1_12:ldc1_13:ldc1_14:ldc1_15:ldc1_16:ldc1_17:ldc1_18:ldc1_19:ldc1_20:ldc1_21:ldc1_22:ldc1_23:ldc1_24:ldc1_25:ldc1_26:ldc1_27:ldcbeta:ldclatestci
 group.ldc.compilerType=ldc
 group.ldc.isSemVer=true
 group.ldc.baseName=ldc
@@ -99,6 +99,9 @@ compiler.ldc1_25.options=-gcc=gcc
 compiler.ldc1_26.exe=/opt/compiler-explorer/ldc1.26.0/ldc2-1.26.0-linux-x86_64/bin/ldc2
 compiler.ldc1_26.semver=1.26.0
 compiler.ldc1_26.options=-gcc=gcc
+compiler.ldc1_27.exe=/opt/compiler-explorer/ldc1.27.1/ldc2-1.27.1-linux-x86_64/bin/ldc2
+compiler.ldc1_27.semver=1.27.1
+compiler.ldc1_27.options=-gcc=gcc
 compiler.ldcbeta.exe=/opt/compiler-explorer/ldcbeta/bin/ldc2
 compiler.ldcbeta.semver=beta
 compiler.ldcbeta.options=-gcc=gcc